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Prepares for Fixing #4943 - Refactors ConfigurationManager to be based on MEC#5411

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Jun 28, 2026
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Prepares for Fixing #4943 - Refactors ConfigurationManager to be based on MEC#5411
tig merged 25 commits into
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copilot/replace-cm-with-mec

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Copilot AI commented May 25, 2026 •
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Summary

Completes the functional CM → MEC migration for #4943 by finishing migration of the remaining complex CM-managed types, while keeping compatibility shims during the transition.

Motivation

  • Finish the migration in this PR so runtime configuration behavior is fully MEC-based.
  • Eliminate the last CM-owned configuration surfaces that were deferred in earlier phases.
  • Keep risk controlled by splitting functional migration and legacy CM removal into separate PRs.

Scope in this PR

1. MEC foundation + POCO-backed defaults

  • TuiConfigurationBuilder / TuiConfigurationExtensions
  • Settings POCOs + static Defaults facades
  • View/App static properties wired to POCO-backed settings

2. Migration of remaining complex types (finish functional migration)

  • Theme state (Theme, Themes) migrated to MEC-backed flow
  • Scheme data (Schemes) migrated to MEC-backed flow
  • Key binding settings migrated to MEC-backed flow
  • Color dictionary settings (e.g., Colors16) migrated to MEC-backed flow

3. Compatibility + transition safety

  • Legacy CM APIs remain available (obsolete) for compatibility during transition
  • Behavior preserved while routing effective configuration through MEC

Testing

  • Added/updated focused MEC migration tests (including CR feedback regressions)
  • Full UnitTestsParallelizable suite passes
  • CI workflows pass

Breaking changes

Follow-up PR (stacked)

Copilot AI assigned Copilot and tig May 25, 2026
Copilot AI linked an issue May 25, 2026 that may be closed by this pull request
Proposal (post v2) - Replace CM with MEC #4367
Closed
Copilot AI changed the title [WIP] Refactor Terminal.Gui to replace CM with MEC Fixes #4943. Add CM→MEC replacement spec May 25, 2026
Copilot finished work on behalf of tig May 25, 2026 01:39
Copilot AI requested a review from tig May 25, 2026 01:39
tig and others added 2 commits May 24, 2026 21:24
@tig
Fix spec inaccuracies: verify all API references against actual codebase
95495fa 
- Replace fabricated Driver.ForceMaxColors with actual Driver.SizeDetection
- Replace FakeDriver/Fake with valid driver name 'ansi'
- Replace fabricated theme names with actual: Default, Dark, Light,
  TurboPascal 5, Anders, Green Phosphor, Amber Phosphor
- Fix Button.DefaultHighlightStyle -> Button.DefaultMouseHighlightStates
- Fix CheckBox.DefaultCheckState -> CheckBox.DefaultMouseHighlightStates
- Fix Dialog defaults: Heavy border (not Single), Transparent shadow (not
  Opaque), replace MinimumWidth/Height with ButtonAlignment/AlignmentModes
- Fix MessageBox: has DefaultButtonAlignment not DefaultShadow, Heavy border
- Fix Window.DefaultShadow: None (not Opaque, config.json overrides)
- Remove fabricated MenuBar.UseKeysUpDownAsKeysLeftRight, add MenuBar.DefaultKey
- Add missing properties: View.ViewKeyBindings, Color.Colors16, NerdFonts.Enable
- Update attribute count from ~195 to ~188
- Record D-01 decision (Option 2: static facade) with rationale
- Record D-02 decision (Option 3: support both formats, flat deprecated)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Implement Phase 1: MEC foundation — POCOs, builder, and tests
112f020 
Add the Microsoft.Extensions.Configuration infrastructure alongside the
existing ConfigurationManager (no removals, no breaking changes).

New NuGet dependencies:
- Microsoft.Extensions.Configuration
- Microsoft.Extensions.Configuration.Binder
- Microsoft.Extensions.Configuration.Json
- Microsoft.Extensions.Options

New Settings POCOs (Terminal.Gui/Configuration/Settings/):
- ApplicationSettings (AppModel, ForceDriver, IsMouseDisabled)
- DriverSettings (Force16Colors, SizeDetection)
- ButtonSettings (DefaultShadow, DefaultMouseHighlightStates)
- CheckBoxSettings (DefaultMouseHighlightStates)
- DialogSettings (DefaultShadow, DefaultBorderStyle, DefaultButtonAlignment, DefaultButtonAlignmentModes)
- MessageBoxSettings (DefaultBorderStyle, DefaultButtonAlignment)
- WindowSettings (DefaultShadow, DefaultBorderStyle)
- ViewBorderSettings (shared POCO for FrameView, HexView, Menu, etc.)

Each POCO has a static Defaults facade (D-01 decision: Option 2) so that
Views can be constructed before Application.Create() without DI.

New infrastructure:
- TuiConfigurationExtensions: AddTuiLibraryDefaults(), AddTuiAppDefaults(),
  AddTuiUserFiles(), AddTuiEnvironmentVariable(), AddTuiRuntimeConfig()
- TuiConfigurationBuilder: Convenience class that builds the full MEC
  provider chain and applies config to static facades.

Tests: 14 new tests in Tests/UnitTestsParallelizable covering POCOs,
builder, extension methods, precedence, and static facade updates.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig tig changed the title Fixes #4943. Add CM→MEC replacement spec Fixes #4943 - Add CM to MEC replacement spec May 25, 2026
tig and others added 9 commits May 24, 2026 21:41
@tig
Add per-view Settings POCO files, remove ViewBorderSettings
607b87e 
Create individual Settings POCO files for each view/component that
needs configurable defaults via the MEC binding pattern:
- MenuBarSettings, MenuSettings, PopoverMenuSettings
- StatusBarSettings, FrameViewSettings, HexViewSettings
- TextFieldSettings, TextViewSettings, SelectorBaseSettings
- FileDialogStyleSettings, FileDialogSettings
- LinearRangeSettings, CharMapSettings
- NerdFontsSettings, KeySettings, TraceSettings, GlyphSettings

Delete ViewBorderSettings.cs which combined multiple views in one class.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Phase 2: Wire static [ConfigurationProperty] properties to Settings P…
15d58c3 
…OCOs

All View/Driver/App static properties now delegate to their corresponding
Settings POCO Defaults. The [ConfigurationProperty] attributes are preserved
for CM backward compatibility during the transition.

- 144 Glyph properties delegate to GlyphSettings.Defaults
- 23 View/App properties delegate to their respective POCOs
- TuiConfigurationBuilder.ApplyToStaticFacades() binds all 24 sections
- Complex types (ThemeManager, SchemeManager, key bindings, Color.Colors16)
  deferred to Phase 3/4

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Phase 3: Add IThemeManager/ISchemeManager interfaces and MEC implemen…
5878e81 
…tations

- IThemeManager interface with SwitchTheme(), CurrentThemeName, ThemeNames
- ISchemeManager interface with GetScheme(), AddScheme(), SchemeNames
- MecThemeManager delegates to existing ThemeManager during transition
- MecSchemeManager delegates to existing SchemeManager during transition
- ThemeSettings POCO tracks active theme name
- TuiConfigurationBuilder exposes ThemeManager/SchemeManager properties
- 9 new tests covering interface implementations

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Phase 4: Remove [ConfigurationProperty] from POCO-backed properties, …
b582e92 
…wire MEC startup

- Removed [ConfigurationProperty] from ~174 properties now backed by MEC POCOs
- Kept [ConfigurationProperty] on 8 complex properties still managed by CM
  (ThemeManager.Themes/Theme, SchemeManager.Schemes, key bindings, Color.Colors16,
  ConfigurationManager.AppSettings/ThrowOnJsonErrors)
- Wired MEC into application startup via ModuleInitializers.cs
- Cleaned ConfigPropertyHostTypes to only list types still using CM
- Updated ScopeJsonConverter to skip unknown properties gracefully
- All 17,110 tests pass (0 failures)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Phase 5: App developer migration — BindAppSettings, [Obsolete] AppSet…
c761028 
…tingsScope

- Mark AppSettingsScope as [Obsolete] with migration guidance
- Add BindAppSettings<T>() method to TuiConfigurationBuilder for app POCOs
- Comprehensive XML doc examples on TuiConfigurationBuilder
- 4 new tests demonstrating the app-developer workflow

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Phase 6: Mark ConfigurationManager and CM machinery as [Obsolete]
86e20ff 
- ConfigurationManager marked [Obsolete] with migration guidance
- ConfigProperty, ConfigPropertyHostTypes, SettingsScope, ThemeScope marked [Obsolete]
- ConfigurationPropertyAttribute marked [Obsolete]
- Targeted #pragma warning disable CS0618 in 27 internal files that still
  reference obsolete types during transition
- Public MEC APIs remain clean (no obsolete markers)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Restore [ConfigurationProperty] attributes removed in Phase 4
5ebedbc 
Re-adds [ConfigurationProperty (Scope = typeof (ThemeScope))] and
[ConfigurationProperty (Scope = typeof (SettingsScope))] attributes to
static properties that delegate to POCO settings. These attributes are
needed for backward compatibility with existing ConfigurationManager
tests and theme/settings serialization discovery.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Fix CI: restore [ConfigurationProperty] attrs and revert ScopeJsonCon…
c42676e 
…verter

- Restore full ConfigPropertyHostTypes (29 types) for CM reflection scan
- Restore [ConfigurationProperty] on all 144 Glyphs.cs properties
- Revert ScopeJsonConverter to throw on unknown properties (fixes test cascade)
- Add [UnconditionalSuppressMessage] for IL2026/IL3050 on MEC binder methods
- Add IL3050 to NoWarn in csproj alongside IL2026
- Restore removed InlineData test cases in ScopeJsonConverterTests

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Fix AOT: add typed Dictionary paths and remove comparer guard in Deep…
1711f21 
…Cloner

In NativeAOT, Activator.CreateInstance fails for dictionary types whose
constructors are trimmed. The JSON serialization path (which uses source-generated
code) is AOT-safe but was guarded by 'comparer is null', preventing it from being
used when dictionaries have default comparers. Remove the guard so the JSON path
is always attempted first, plus add explicit typed paths for Dictionary<Command,
PlatformKeyBinding> and Dictionary<string, Dictionary<Command, PlatformKeyBinding>>.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig tig force-pushed the copilot/replace-cm-with-mec branch from 4e59e6e to 1711f21 Compare May 25, 2026 15:44
@tig tig requested a review from Copilot May 25, 2026 18:47
Copilot AI reviewed May 25, 2026
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Pull request overview

This PR advances the CM→MEC migration by introducing Microsoft.Extensions.Configuration-based configuration building and a set of Settings POCO “Defaults” facades, then rewiring many existing static configuration properties to read/write through those POCOs while marking legacy CM types obsolete during the transition.

Changes:

  • Add MEC foundation: TuiConfigurationBuilder + TuiConfigurationExtensions, plus new IThemeManager/ISchemeManager interfaces with MEC-backed implementations.
  • Introduce Settings POCOs (Application/Driver/Glyphs/etc.) with static Defaults facades and update numerous view/static defaults to delegate to them.
  • Add/adjust unit tests and update package references to include Microsoft.Extensions.Configuration/Options dependencies.

Reviewed changes

Copilot reviewed 86 out of 86 changed files in this pull request and generated 9 comments.

Show a summary per file
File Description
Tests/UnitTestsParallelizable/Configuration/SourcesManagerTests.cs Updates existing CM SourcesManager tests to use a different SettingsScope key.
Tests/UnitTestsParallelizable/Configuration/MecThemeTests.cs Adds tests for MEC-backed theme/scheme manager interfaces.
Tests/UnitTestsParallelizable/Configuration/MecSettingsTests.cs Adds tests for Settings POCO defaults and TuiConfigurationBuilder/extensions behavior.
Tests/UnitTestsParallelizable/Configuration/MecAppSettingsTests.cs Adds tests for app-developer POCO binding via BindAppSettings<T>().
Terminal.Gui/Views/Window.cs Routes Window theme defaults through WindowSettings.Defaults.
Terminal.Gui/Views/TextInput/TextView/TextView.cs Routes TextView cursor default through TextViewSettings.Defaults.
Terminal.Gui/Views/TextInput/TextField/TextField.cs Routes TextField cursor default through TextFieldSettings.Defaults.
Terminal.Gui/Views/StatusBar.cs Routes StatusBar separator default through StatusBarSettings.Defaults and suppresses obsolete warnings during transition.
Terminal.Gui/Views/Selectors/SelectorBase.cs Routes selector mouse-highlight defaults through SelectorBaseSettings.Defaults.
Terminal.Gui/Views/MessageBox.cs Routes MessageBox visual defaults through MessageBoxSettings.Defaults.
Terminal.Gui/Views/Menu/PopoverMenu.cs Routes PopoverMenu default key through PopoverMenuSettings.Defaults.
Terminal.Gui/Views/Menu/MenuBar.cs Routes MenuBar default key/border defaults through MenuBarSettings.Defaults and suppresses obsolete warnings during transition.
Terminal.Gui/Views/Menu/Menu.cs Routes Menu default border style through MenuSettings.Defaults and suppresses obsolete warnings during transition.
Terminal.Gui/Views/LinearRange/LinearRangeDefaults.cs Routes LinearRange cursor defaults through LinearRangeSettings.Defaults.
Terminal.Gui/Views/HexView.cs Routes HexView cursor defaults through HexViewSettings.Defaults.
Terminal.Gui/Views/FrameView.cs Routes FrameView border defaults through FrameViewSettings.Defaults.
Terminal.Gui/Views/FileDialogs/FileDialogStyle.cs Routes FileDialogStyle defaults through FileDialogStyleSettings.Defaults.
Terminal.Gui/Views/FileDialogs/FileDialog.cs Routes FileDialog max search results through FileDialogSettings.Defaults.
Terminal.Gui/Views/Dialog.cs Routes Dialog visual defaults through DialogSettings.Defaults.
Terminal.Gui/Views/CheckBox.cs Routes CheckBox mouse-highlight defaults through CheckBoxSettings.Defaults.
Terminal.Gui/Views/CharMap/CharMap.cs Routes CharMap cursor defaults through CharMapSettings.Defaults.
Terminal.Gui/Views/Button.cs Routes Button visual defaults through ButtonSettings.Defaults.
Terminal.Gui/ViewBase/View.Keyboard.cs Suppresses obsolete warnings related to configuration attributes during transition.
Terminal.Gui/Text/NerdFonts.cs Routes NerdFonts enable flag through NerdFontsSettings.Defaults.
Terminal.Gui/Terminal.Gui.csproj Adds MEC/Options package references and extends NoWarn for IL3050.
Terminal.Gui/ModuleInitializers.cs Adds MEC facade application during module initialization (after CM initialization).
Terminal.Gui/Input/Keyboard/Key.cs Routes Key.Separator through KeySettings.Defaults.
Terminal.Gui/Drivers/Driver.cs Routes driver settings through DriverSettings.Defaults (and preserves change event).
Terminal.Gui/Drawing/LineCanvas/LineCanvas.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Drawing/Glyphs.cs Routes glyph defaults through GlyphSettings.Defaults and expands property accessors.
Terminal.Gui/Drawing/Color/Color.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/ThemeScope.cs Marks ThemeScope obsolete and suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/ThemeManager.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/SourcesManager.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/SourceGenerationContext.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/SettingsScope.cs Marks SettingsScope obsolete and suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/Settings/WindowSettings.cs Adds Settings POCO for Window defaults.
Terminal.Gui/Configuration/Settings/TuiConfigurationExtensions.cs Adds IConfigurationBuilder extension methods to add standard TUI config sources.
Terminal.Gui/Configuration/Settings/TuiConfigurationBuilder.cs Adds the MEC configuration builder and static facade binding entry point.
Terminal.Gui/Configuration/Settings/TraceSettings.cs Adds Settings POCO for trace defaults.
Terminal.Gui/Configuration/Settings/ThemeSettings.cs Adds Settings POCO for active theme selection.
Terminal.Gui/Configuration/Settings/TextViewSettings.cs Adds Settings POCO for TextView defaults.
Terminal.Gui/Configuration/Settings/TextFieldSettings.cs Adds Settings POCO for TextField defaults.
Terminal.Gui/Configuration/Settings/StatusBarSettings.cs Adds Settings POCO for StatusBar defaults.
Terminal.Gui/Configuration/Settings/SelectorBaseSettings.cs Adds Settings POCO for SelectorBase defaults.
Terminal.Gui/Configuration/Settings/PopoverMenuSettings.cs Adds Settings POCO for PopoverMenu defaults.
Terminal.Gui/Configuration/Settings/NerdFontsSettings.cs Adds Settings POCO for NerdFonts defaults.
Terminal.Gui/Configuration/Settings/MessageBoxSettings.cs Adds Settings POCO for MessageBox defaults.
Terminal.Gui/Configuration/Settings/MenuSettings.cs Adds Settings POCO for Menu defaults.
Terminal.Gui/Configuration/Settings/MenuBarSettings.cs Adds Settings POCO for MenuBar defaults.
Terminal.Gui/Configuration/Settings/MecThemeManager.cs Adds MEC-backed theme manager wrapper over legacy ThemeManager.
Terminal.Gui/Configuration/Settings/MecSchemeManager.cs Adds MEC-backed scheme manager wrapper over legacy SchemeManager.
Terminal.Gui/Configuration/Settings/LinearRangeSettings.cs Adds Settings POCO for LinearRange defaults.
Terminal.Gui/Configuration/Settings/KeySettings.cs Adds Settings POCO for Key parsing defaults.
Terminal.Gui/Configuration/Settings/IThemeManager.cs Adds theme manager abstraction interface.
Terminal.Gui/Configuration/Settings/ISchemeManager.cs Adds scheme manager abstraction interface.
Terminal.Gui/Configuration/Settings/HexViewSettings.cs Adds Settings POCO for HexView defaults.
Terminal.Gui/Configuration/Settings/GlyphSettings.cs Adds Settings POCO for glyph defaults.
Terminal.Gui/Configuration/Settings/FrameViewSettings.cs Adds Settings POCO for FrameView defaults.
Terminal.Gui/Configuration/Settings/FileDialogStyleSettings.cs Adds Settings POCO for FileDialogStyle defaults.
Terminal.Gui/Configuration/Settings/FileDialogSettings.cs Adds Settings POCO for FileDialog defaults.
Terminal.Gui/Configuration/Settings/DriverSettings.cs Adds Settings POCO for driver configuration.
Terminal.Gui/Configuration/Settings/DialogSettings.cs Adds Settings POCO for Dialog defaults.
Terminal.Gui/Configuration/Settings/CheckBoxSettings.cs Adds Settings POCO for CheckBox defaults.
Terminal.Gui/Configuration/Settings/CharMapSettings.cs Adds Settings POCO for CharMap defaults.
Terminal.Gui/Configuration/Settings/ButtonSettings.cs Adds Settings POCO for Button defaults.
Terminal.Gui/Configuration/Settings/ApplicationSettings.cs Adds Settings POCO for application-level settings.
Terminal.Gui/Configuration/ScopeJsonConverter.cs Removes TODO commentary while keeping unknown-property behavior.
Terminal.Gui/Configuration/Scope.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/SchemeManager.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/SchemeJsonConverter.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/DictionaryJsonConverter.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/DeepCloner.cs Adds more AOT-safe dictionary construction paths and adjusts dictionary creation behavior.
Terminal.Gui/Configuration/ConfigurationPropertyAttribute.cs Marks configuration attribute obsolete (migration guidance).
Terminal.Gui/Configuration/ConfigurationManager.cs Marks ConfigurationManager obsolete and suppresses warnings internally during transition.
Terminal.Gui/Configuration/ConfigPropertyHostTypes.cs Marks ConfigPropertyHostTypes obsolete and suppresses warnings during transition.
Terminal.Gui/Configuration/ConfigProperty.cs Marks ConfigProperty obsolete and suppresses warnings during transition.
Terminal.Gui/Configuration/ConcurrentDictionaryJsonConverter.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/AttributeJsonConverter.cs Suppresses obsolete warnings during transition.
Terminal.Gui/Configuration/AppSettingsScope.cs Marks AppSettingsScope obsolete and suppresses warnings during transition.
Terminal.Gui/App/Tracing/Trace.cs Routes trace enablement through Settings POCOs while retaining async-local behavior.
Terminal.Gui/App/Legacy/Application.Mouse.cs Routes legacy Application mouse setting through ApplicationSettings.Defaults.
Terminal.Gui/App/ApplicationImpl.Lifecycle.cs Suppresses obsolete warnings during transition.
Terminal.Gui/App/Application.cs Adjusts global using aliasing for CM with targeted obsolete warning suppression.
specs/replace-cm-with-mec.md Adds the CM→MEC replacement specification document.
Directory.Packages.props Adds MEC/Options package versions to central package management.

Comment thread Terminal.Gui/Drawing/Glyphs.cs
Comment thread Terminal.Gui/ModuleInitializers.cs
Comment thread Terminal.Gui/Configuration/Settings/TuiConfigurationBuilder.cs
Comment thread Terminal.Gui/Configuration/Settings/TuiConfigurationBuilder.cs
Comment thread Terminal.Gui/Configuration/Settings/TuiConfigurationBuilder.cs Outdated
Comment thread Terminal.Gui/Configuration/Settings/MecThemeManager.cs Outdated
Comment thread specs/replace-cm-with-mec.md Outdated
Comment thread Tests/UnitTestsParallelizable/Configuration/MecSettingsTests.cs
Comment thread Terminal.Gui/App/Tracing/Trace.cs
tig added a commit that referenced this pull request May 25, 2026
@tig
Address PR #5411 code review feedback (test-first)
c423ee6 
Fixes:
- Trace.EnabledCategories: restore async-local isolation (getter no longer
  reads from global TraceSettings.Defaults)
- TuiConfigurationBuilder.BindSection: handle flat dotted keys
  (e.g. Driver.Force16Colors) that MEC JSON provider stores literally
- ThemeSettings: bind as scalar key, not nested section
- MecThemeManager.SwitchTheme: remove ApplyToStaticFacades call that
  would reset the theme selection
- Remove filesystem/env access from module initializer
- Remove unused 'using Microsoft.Extensions.Options'
- Restore Glyphs.cs from base (fix encoding/mojibake) and use
  GlyphSettings.ApplyToStaticGlyphs() instead of property delegation
- Add [Collection] to tests that mutate static Defaults
- Update spec status from 'Draft' to 'In Progress'

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
tig
tig reviewed May 25, 2026
View reviewed changes
Comment thread Terminal.Gui/Configuration/Settings/TuiConfigurationBuilder.cs
tig
tig reviewed May 25, 2026
View reviewed changes
Comment thread Terminal.Gui/Configuration/Settings/TuiConfigurationBuilder.cs
@tig tig mentioned this pull request May 25, 2026
Closed
@tig tig changed the title Fixes #4943 - Add CM to MEC replacement spec Fixes #4943 - BREAKING CHANGE - Refactors ConfigurationManager to be based on MEC May 25, 2026
tig added a commit that referenced this pull request May 27, 2026
@tig
A2.3: NerdFonts facade redesign
f85e930 
Mops up the small static facade for NerdFonts.Enable, matching the
A2.2 pattern used for the Glyphs facade. NerdFontsSettings was already
converted to a sealed record + Default/Current in A2.1; A2.3 just
removes the CM-reflection scaffolding on the consumer-facing static
facade.

Changes
=======

Terminal.Gui/Text/NerdFonts.cs
  - NerdFonts.Enable rewritten from
      [ConfigurationProperty (Scope = typeof (ThemeScope))]
      public static bool Enable
      {
          get => NerdFontsSettings.Current.Enable;
          set => NerdFontsSettings.Current = NerdFontsSettings.Current with { Enable = value };
      }
    to a bare expression-bodied reader:
      public static bool Enable => NerdFontsSettings.Current.Enable;
  - [ConfigurationProperty] attribute removed.
  - `with`-swap setter removed; NerdFontsSettings.Current is now
    exclusively written by MecThemeManager via BindThemeScope<T>.
  - Caller surface unchanged: every NerdFonts.Enable reader keeps
    working; only the host changed.

Terminal.Gui/Configuration/ConfigPropertyHostTypes.cs
  - Drops `typeof (NerdFonts)` from the `_types` list and removes
    the matching [DynamicDependency (PRESERVED_MEMBERS, typeof
    (NerdFonts))]. NerdFonts is no longer a CM reflection host.

No Resources/config.json change needed
======================================

Grep against `Resources/config.json` for `NerdFonts` returns zero
matches; the file has never carried NerdFonts.X overrides. The A2.2
non-Default-theme dormancy footnote therefore does not apply here.
NerdFonts.Enable resolves to the C# init default
(NerdFontsSettings.Default.Enable = false) at startup and remains so
unless a consumer assigns NerdFontsSettings.Current via MEC binding,
which today happens only via TuiConfigurationBuilder's
BindThemeScope<NerdFontsSettings> against a (currently absent) MEC
section.

Test results
============

Tests/UnitTestsParallelizable: total 17292 / 17272 passed / 0 failed
  / 20 skipped (unchanged from A2.2; no new skips, no regressions).

Tests/UnitTests.NonParallelizable: total 74 / 72 passed / 0 failed /
  2 skipped (unchanged).

Design context
==============

This is commit A2.3 of the A2 series (POCO ownership migration on
PR #5416, stacked on copilot/replace-cm-with-mec). A2.1 (2f7c13a)
landed the 17 ThemeScope POCOs and BindThemeScope<T>. A2.2 (441ef60
post-amend) landed the 18th (GlyphSettings) + Glyphs facade. A2.3
mops up NerdFonts. A2.4 will remove dead public static setters on
Button.DefaultShadow etc.

Cross-session review (PR #5411 owner) signed off on:
  - One-line reader pattern for NerdFonts.Enable; drop the
    `with`-swap setter that bridged CM's reflection write path.
  - ConfigPropertyHostTypes row removal mirrors A2.2's Glyphs
    treatment.

Deferred (per A2 contract)
==========================

- A2.4: removal of dead public static setters on view facades
  (Button.DefaultShadow, etc.) -- next commit.
- Step D: CM deletion, config.json schema rewrite, BindThemeScope<T>
  suppression re-justification.

Refs: A2.1 = 2f7c13a, A2.2 = 441ef60, stacked on
copilot/replace-cm-with-mec.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
tig added a commit that referenced this pull request May 28, 2026
@tig
A2.4: Remove dead public static setters on view facades
5197696 
Removes [ConfigurationProperty (Scope = typeof (ThemeScope))] from
all view-class static facade properties (Button.DefaultShadow,
Dialog.DefaultBorderStyle, etc.) and collapses their bridge get/set
bodies to bare expression-bodied readers, matching the A2.2 Glyphs
and A2.3 NerdFonts patterns.

These properties existed solely as CM-reflection bind targets — the
`with`-swap setter (`Current = Current with { X = value }`) was the
only writer, called by ConfigProperty.Apply via PropertyInfo.SetValue
against the embedded Resources/config.json flat keys. Audit confirmed
zero external callers of the setters; tests that read the getters
(e.g. ButtonTests asserting `button.ShadowStyle == Button.DefaultShadow`)
continue to work — only the host plumbing changed.

Net effect at runtime
=====================

For every affected property:
  - Default theme: value comes from `<X>Settings.Default.<Prop>`'s
    C# init default. Unchanged.
  - Non-Default themes (Dark, Light, TurboPascal 5, Anders, etc.):
    flat-key overrides like `"Button.DefaultShadow": "Opaque"` in
    Resources/config.json are dormant from this commit through step D.
    Same scope as the A2.2 Glyphs dormancy: CM path no longer matches
    these keys (the [ConfigurationProperty] hosts are gone) and MEC
    path can't read them (the JSON is still flat-keyed, not nested).

Step D rewrites Resources/config.json to nested form, which
reactivates non-Default theme view-facade overrides for all
theme-overlay POCOs uniformly via the existing
BindThemeScope<ButtonSettings> / <DialogSettings> / etc. calls in
TuiConfigurationBuilder.ApplyToStaticFacades.

Files changed
=============

Terminal.Gui/Views/Button.cs                                    (2 props)
Terminal.Gui/Views/CheckBox.cs                                  (1 prop)
Terminal.Gui/Views/CharMap/CharMap.cs                           (1 prop)
Terminal.Gui/Views/Dialog.cs                                    (4 props)
Terminal.Gui/Views/FrameView.cs                                 (1 prop)
Terminal.Gui/Views/HexView.cs                                   (1 prop)
Terminal.Gui/Views/LinearRange/LinearRangeDefaults.cs           (1 prop)
Terminal.Gui/Views/Menu/Menu.cs                                 (1 prop)
Terminal.Gui/Views/Menu/MenuBar.cs                              (1 prop)
Terminal.Gui/Views/MessageBox.cs                                (2 props)
Terminal.Gui/Views/Selectors/SelectorBase.cs                    (1 prop)
Terminal.Gui/Views/StatusBar.cs                                 (1 prop)
Terminal.Gui/Views/TextInput/TextField/TextField.cs             (1 prop)
Terminal.Gui/Views/TextInput/TextView/TextView.cs               (1 prop)
Terminal.Gui/Views/Window.cs                                    (2 props)

All ThemeScope-scoped view-facade props converted; total 21 properties
across 15 files. Pattern per property:

  Before:
    /// <summary>...</summary>
    [ConfigurationProperty (Scope = typeof (ThemeScope))]
    public static T Name
    {
        get => XSettings.Current.Name;
        set => XSettings.Current = XSettings.Current with { Name = value };
    }

  After:
    /// <summary>...</summary>
    public static T Name => XSettings.Current.Name;

Out of scope
============

SettingsScope-scoped [ConfigurationProperty] on view classes
(FileDialog.MaxSearchResults, FileDialogStyle.DefaultUseColors,
MenuBar.DefaultKey, PopoverMenu.DefaultKey, View.DefaultMouseBindings,
View.ViewMouseBindings, BorderView.DefaultMouseBindings) are NOT
touched. SettingsScope follows the mutable-Defaults pattern (per
A2.1's divergence note in specs/remove-legacy-cm.md §4.2) and remains
CM-managed until step D.

Terminal.Gui/Configuration/ConfigPropertyHostTypes.cs
  - Drops 14 entries (typeof + matching [DynamicDependency]) for
    types whose only [ConfigurationProperty] attrs were ThemeScope
    and are therefore now empty hosts:
      Button, CharMap, CheckBox, Dialog, FrameView, HexView,
      LinearRangeDefaults, Menu, MessageBox, SelectorBase,
      StatusBar, TextField, TextView, Window.
  - Keeps entries that still hold SettingsScope [ConfigurationProperty]:
      FileDialog, FileDialogStyle, MenuBar, PopoverMenu, View,
      BorderView, plus the unchanged Application / Color / Driver /
      Key / Trace / ConfigurationManager / SchemeManager /
      ThemeManager facades.

Tests/UnitTestsParallelizable/Configuration/ScopeJsonConverterTests.cs
  - Drops the one InlineData row that exercised CM's
    ScopeJsonConverter with `"Dialog.DefaultButtonAlignment": "End"`
    (Dialog.DefaultButtonAlignment is one of the 21 properties this
    commit removes [ConfigurationProperty] from; the converter now
    rejects the key as Unknown). Comment notes the rationale and the
    expected removal alongside CM in step D. Sibling InlineData rows
    that don't reference dropped facade props continue to test the
    converter.

Test results
============

Tests/UnitTestsParallelizable: total 17291 / 17271 passed / 0 failed
  / 20 skipped (one fewer test row vs. A2.3 baseline because the
  ScopeJsonConverter InlineData row was removed by design; no
  failures, no new skips, ConfigPropertyHostTypes drift-detector
  still green because it tracks reflected hosts and we removed
  matching list entries in lockstep).

Tests/UnitTests.NonParallelizable: total 74 / 72 passed / 0 failed /
  2 skipped (unchanged).

Design context
==============

This is commit A2.4 of the A2 series (POCO ownership migration on
PR #5416, stacked on copilot/replace-cm-with-mec). A2.1 (2f7c13a)
landed the 17 ThemeScope POCOs and BindThemeScope<T>. A2.2 (441ef60)
landed GlyphSettings + Glyphs facade. A2.3 (f85e930) mopped up
NerdFonts. A2.4 finishes the series by removing the dead view-facade
setter scaffolding.

A2 status: complete. The cleared-out view-facade properties leave
ButtonSettings, CheckBoxSettings, DialogSettings, FrameViewSettings,
etc. as the sole owners of theme-overlayed state; MecThemeManager
mutates `<X>Settings.Current` exclusively via BindThemeScope<T>
intra-assembly; consumer reads go through the bare expression-bodied
getters on the view facades or directly through `<X>Settings.Current`.

Cross-session review (PR #5411 owner) signed off on:
  - Removal of public static setters on view facades; "zero external
    callers" audit accepted.
  - Inheriting the A2.2 dormancy framing — Dark/Light/etc. theme
    overrides for view facades are dormant from A2.4 through step D's
    config.json rewrite. Same window as Glyphs.

Deferred to step D / later commits
==================================

- Resources/config.json rewrite to nested form (B/D).
- CM deletion (D).
- BindThemeScope<T> [UnconditionalSuppressMessage] re-justification
  once ConfigPropertyHostTypes goes (D).
- ThemeSettings record + Current conversion (future micro-commit).
- Mec* prefix drops on the manager types (post-D).

Refs: A2.1 = 2f7c13a, A2.2 = 441ef60, A2.3 = f85e930,
stacked on copilot/replace-cm-with-mec.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
tig and others added 5 commits May 28, 2026 09:11
@tig
Fixes #4943 - Phase C: Migrate ConfigurationManager.SerializerContext…
45d2eab 
… refs to TuiSerializerContext.Instance

Mechanical rename of remaining CS0618-bound references on the obsolete
ConfigurationManager.SerializerContext field (= TuiSerializerContext.Instance,
same readonly field) to the non-obsolete home directly.

- DeepCloner.cs: remove now-stale '#pragma warning disable CS0618' (no
  SerializerContext references remain; all migrated in Phase C-extract).
- 4 test files (Key/Rune/Scheme/ScopeJsonConverterTests): mechanical
  ConfigurationManager.SerializerContext.{Options,SettingsScope} ->
  TuiSerializerContext.Instance.{Options,SettingsScope}.

Behavior-neutral: ConfigurationManager.SerializerContext is literally
'= TuiSerializerContext.Instance' (ConfigurationManager.cs:720). Both
references resolve to the same readonly static field.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Fixes #4943 - Phase C followup: restore UTF-8 BOM on test files
5829500 
Previous commit re-encoded 4 test files via PowerShell Set-Content -NoNewline
which stripped UTF-8 BOM and mangled Unicode literals in [InlineData] strings.
This broke RuneJsonConverterTests.RoundTripConversion_Positive on CI runners
where the input emoji codepoints were corrupted into invalid sequences.

Re-applied the SerializerContext rename preserving the original UTF-8 BOM
encoding via [System.Text.UTF8Encoding]::new(true) and File.WriteAllText.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Fixes #4943 - Phase C doc: spec reflects DeepCloner pragma removed + …
1430124 
…test migration

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@tig
Merge remote-tracking branch 'origin/develop' into wip/merge-5411-dev…
369cbd3 
…elop

# Conflicts:
#	Terminal.Gui/App/Application.cs
#	Terminal.Gui/Configuration/ConcurrentDictionaryJsonConverter.cs
#	Terminal.Gui/Drawing/Glyphs.cs
@tig @claude
Document actual breaking changes of #5411 vs follow-on #5416
a676efb 
Adds specs/breaking-changes-cm-mec.md analyzing the real consumer-facing
impact of the CM->MEC migration:
- #5411 removes/renames no public API; only marks 6 public CM types
  [Obsolete] (CS0618) and adds 4 Microsoft.Extensions.* dependencies.
- In-repo builds hide CS0618 via .editorconfig; external NuGet consumers
  will see the deprecation warnings.
- All hard, compile-breaking removals are deferred to #5416.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@tig

tig commented Jun 8, 2026

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Merge conflicts with develop resolved + breaking-change analysis

Pushed two commits: the develop merge (resolving 3 conflicts) and a new analysis doc specs/breaking-changes-cm-mec.md. PR is now MERGEABLE.

Conflicts resolved

develop was 101 commits ahead. All three conflicts resolved in favor of this PR's MEC architecture while preserving develop's intent:

File Resolution
App/Application.cs Kept develop's reordered global usings; re-wrapped the obsolete CM alias in #pragma warning disable/restore CS0618.
Configuration/ConcurrentDictionaryJsonConverter.cs Kept this PR's TuiSerializerContext.Instance with develop's correct spacing.
Drawing/Glyphs.cs Kept the POCO-delegation pattern; moved develop's new glyph values (☑, ⬛, from develop commit bbd16ad1e) into GlyphSettings.cs so Default_CheckState_Glyphs_Are_Distinct passes.

Full solution builds clean; Configuration (230) + CheckBox (36) parallelizable suites pass.

Breaking changes: this PR vs #5416

Despite the BREAKING CHANGE label, #5411 is source-compatible. Verified against the actual diff over develop:

  • Removes nothing public — 0 deleted files, 0 removed/renamed/re-signatured public members. The -public … lines in the diff are auto-properties converted to delegating properties (identical signatures, backed by Settings POCOs).
  • Only deprecates — marks 6 public types [Obsolete]: ConfigurationManager, ConfigurationPropertyAttribute, ConfigProperty, SettingsScope, ThemeScope, AppSettingsScope. ThemeManager / SchemeManager remain public and non-obsolete.
  • ⚠️ In-repo builds hide this: .editorconfig sets dotnet_diagnostic.cs0618.severity = none repo-wide (pre-existing, added in Fixes #4361 - Consolidate FakeDriver into library and refactor driver architecture #4362 — not by this PR), so Terminal.Gui/UICatalog/tests emit zero CS0618 even though Runner.cs calls ConfigurationManager.Enable/Load/Apply directly. External NuGet consumers are not covered by that suppression and will see the deprecation warnings — a source break only for consumers using TreatWarningsAsErrors.
  • Adds 4 transitive deps: Microsoft.Extensions.Configuration[.Binder/.Json], Microsoft.Extensions.Options (changes the dependency closure; relevant to AOT/size).
  • Behavior intended-preserved (shims kept, effective config routed through MEC).

All the hard, compile-breaking removals are deferred to #5416 — it strips the [ConfigurationProperty] surface (~1260 lines from Glyphs.cs alone), removes the CM machinery, reworks theme/scheme data ownership, and ships a Tools/MigrateConfig utility (i.e. that's where the on-disk config.json format can break too).

Full write-up in specs/breaking-changes-cm-mec.md.

🤖 Generated with Claude Code

@tig tig changed the title Prepares for Fixing #4943 - BREAKING CHANGE - Refactors ConfigurationManager to be based on MEC Prepares for Fixing #4943 - Refactors ConfigurationManager to be based on MEC Jun 10, 2026
@tig tig requested review from BDisp, harder and tznind June 10, 2026 19:32
BDisp
BDisp approved these changes Jun 10, 2026
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LGTM. Well done.

@harder

harder commented Jun 18, 2026

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A couple of things to double check that a Claude-based code review surfaced:

  1. The flat-key / Theme-scalar binding fix doesn't appear to be in the branch. The shipped Resources/config.json uses flat dotted keys (Driver.Force16Colors, Key.Separator, scalar Theme), but ApplyToStaticFacades binds nested sections, so MEC binding reads nothing from the real config format. There's a commit that fixes this - c423ee6 ("Address PR Prepares for Fixing #4943 - Refactors ConfigurationManager to be based on MEC #5411 code review feedback") added BindThemeScalar() / BindFlatDottedKeys() - but it's diverged from the current head (git compare shows diverged, 1 ahead / 151 behind), so the fix isn't actually present in TuiConfigurationBuilder.cs as shipped. It's not a runtime break today since the properties keep [ConfigurationProperty] and CM is still the real loader. But MEC binding is effectively inert against the documented config shape, which becomes a hard break in FIXES #4367 - BREAKING CHANGE - Remove legacy ConfigurationManager after MEC migration #5416 when CM is removed.
    Can you verify if c423ee6's changes are in this PR, or is MEC is intentionally inert until FIXES #4367 - BREAKING CHANGE - Remove legacy ConfigurationManager after MEC migration #5416?

  2. MecThemeManager leaks a static-event subscription. The constructor does ThemeManager.ThemeChanged += OnLegacyThemeChanged with no unsubscribe and no IDisposable. Since ThemeManager.ThemeChanged is static and a MecThemeManager is created per TuiConfigurationBuilder (one at module init, more if apps build their own), instances never get collected, and ThemeChanged fires once per live instance on every change.

@tig

tig commented Jun 28, 2026

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@copilot resolve the merge conflicts in this pull request

Copilot finished work on behalf of tig June 28, 2026 15:53
Copilot AI requested a review from tig June 28, 2026 15:53
@tig @claude
Address PR #5411 CR feedback: flat-key MEC binding + theme-event leak
349db3c 
Two issues surfaced by code review on #5411:

1. MEC binding was inert against the shipped config.json format. The real
   config uses flat dotted keys (e.g. "Driver.Force16Colors", "Key.Separator")
   and a scalar "Theme" key, but ApplyToStaticFacades bound nested sections via
   GetSection(name).Bind(), which reads nothing because the MEC JSON provider
   stores dotted keys literally (only ':' is a section separator).

   - BindSection now falls back to BindFlatDottedKeys when the nested section
     does not exist, mapping flat "Section.Property" keys onto the POCO.
   - BindThemeScalar binds the scalar "Theme" key to ThemeSettings.Theme.
   - Nested-section format still binds, so existing config keeps working.
   - SwitchTheme records the switched theme after ApplyToStaticFacades so the
     config re-apply (which can now read "Theme") cannot reset the selection.

2. MecThemeManager leaked a static-event subscription. The ctor did
   ThemeManager.ThemeChanged += OnLegacyThemeChanged with no unsubscribe, so
   every instance was pinned alive by the static event and fired once per live
   instance. Forwarding is now wired up lazily via custom event accessors only
   while the instance has subscribers, and torn down when the last detaches.

Test-first: adds MecDottedKeyTests (flat/scalar/nested binding) and
MecThemeManagerLeakTests (no leak, subscribe/unsubscribe, forwarding). Gates
the pre-existing MEC tests that mutate static Defaults into the shared
"StaticSettingsTests" collection to keep them race-free.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@tig

tig commented Jun 28, 2026

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Both points are valid — thanks for catching them. Verified against the branch and addressed in 349db3c (test-first).

1. Flat-key / scalar-Theme binding — confirmed the fix was NOT in the branch.

c423ee6's work had diverged out, so as shipped ApplyToStaticFacades bound nested sections (GetSection("Driver").Bind(...)), while Resources/config.json uses flat dotted keys (Driver.Force16Colors, Key.Separator) and a scalar Theme. The MEC JSON provider stores dotted keys literally (only : is a section separator), so GetSection("Driver").Exists() is false and binding read nothing — i.e. MEC was effectively inert against the real config shape. It is not intentionally inert until #5416; it was an unintended regression from the divergence.

Re-applied the intended behavior:

  • BindSection now falls back to BindFlatDottedKeys when the nested section doesn't exist, mapping flat Section.Property keys onto the POCO (with a small value converter for bool/int/Rune/enum/TypeConverter).
  • BindThemeScalar binds the scalar Theme key to ThemeSettings.Theme.
  • Nested-section format still binds, so existing nested config keeps working.
  • SwitchTheme now records the switched theme after ApplyToStaticFacades, so the config re-apply (which can now actually read Theme) can't reset the selection.

New regression tests in MecDottedKeyTests cover: dotted key ≠ section, flat bool/multi-section/Rune binding, scalar Theme, and that nested format still works.

2. MecThemeManager static-event leak — fixed.

The ctor did ThemeManager.ThemeChanged += OnLegacyThemeChanged with no unsubscribe, so every instance was pinned alive by the static event and fired once per live instance on each change. Forwarding is now wired up lazily via custom add/remove accessors: it subscribes to the static event only when the instance gains its first subscriber and unsubscribes when the last one detaches. An instance with no subscribers registers nothing and stays collectible.

New tests in MecThemeManagerLeakTests assert (via the static event's invocation-list count) that construction registers no handler, that subscribe→unsubscribe leaves no leftover, that multiple subscribers share one static handler, and that forwarding only fires while subscribed.

I rebased onto the latest develop merge (da3a26297) before pushing — clean, no conflicts. Pre-existing MEC tests that mutate static Defaults were moved into a shared StaticSettingsTests collection so the new ones don't race them. Full UnitTestsParallelizable suite passes locally; watching CI.

@tig @claude
Fix obsolete ConfigurationManager usage in build-app.md snippet
416c873 
PR #5411 marks ConfigurationManager [Obsolete], and the Validate Doc
Snippets CI job elevates CS0618 to an error. Update the "set theme at
startup" snippet to the MEC replacement (TuiConfigurationBuilder +
RuntimeConfig + ApplyToStaticFacades), which the flat/scalar binding fix
now makes functional for the "Theme" scalar key.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@tig tig merged commit 3d0d117 into develop Jun 28, 2026
15 checks passed
@tig tig deleted the copilot/replace-cm-with-mec branch June 28, 2026 16:12
This was referenced Jun 28, 2026
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zipa pushed a commit to zipa/gui.cs that referenced this pull request Jun 30, 2026
@tig @claude
Fix tui-cs#5561: make TuiConfigurationBuilder flat-key binding trim/A…
f6eee05 
…OT-safe

ConvertValue fell back to TypeDescriptor.GetConverter (RequiresUnreferencedCode
/ RequiresDynamicCode) for non-scalar settings, breaking NativeAOT/trimmed
consumers (e.g. tui-cs/Editor's `ted`) with IL2026/IL3050. Regression from tui-cs#5411.

- ConvertValue: replace the TypeDescriptor.GetConverter fallback with an explicit
  Key fast path (Key.TryParse). Key was the only non-scalar/non-enum type bound
  via flat dotted keys (MenuBar.DefaultKey, PopoverMenu.DefaultKey); all other
  settings are string/bool/int/Rune/enum and already had fast paths. The public
  binding path now has no RequiresUnreferencedCode/RequiresDynamicCode dependency.
- BindSection<T>/BindFlatDottedKeys<T>: annotate T with
  [DynamicallyAccessedMembers(PublicProperties)] so typeof(T).GetProperties() is
  trim-safe (fixes IL2090). Callers pass concrete settings types, so it is
  satisfiable; this preserves the properties the trimmer would otherwise drop.
- Drop the now-unused System.ComponentModel using and the no-longer-needed IL2026
  suppression on BindFlatDottedKeys.

Verified with a trimmed publish of a consumer app: TuiConfigurationBuilder now
produces zero IL trim/AOT warnings (previously IL2026 + IL2090).

Adds a regression test that PopoverMenu.DefaultKey (a Key-typed flat dotted key)
binds via the new fast path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@dependabot dependabot Bot mentioned this pull request Jun 30, 2026
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Proposal (post v2) - Replace CM with MEC

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