Hand keyboard focus to the opened panel after a right-sidebar file drop - #11059
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughChangesThe change transfers keyboard focus from the right sidebar to opened Markdown panels. Preview panels defer focus until their Right-sidebar focus routing
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This change hands keyboard focus to the opened Markdown panel after a right-sidebar file drop and preserves expected Cmd+F routing; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant RightSidebarFileExplorer
participant Workspace
participant AppDelegate
participant KeyboardFocusCoordinator
participant MarkdownPanel
RightSidebarFileExplorer->>Workspace: handleExternalFileDrop(...)
Workspace->>MarkdownPanel: open file
Workspace->>AppDelegate: handKeyboardFocusFromRightSidebarAfterFileOpen(to:)
AppDelegate->>KeyboardFocusCoordinator: restore main-panel keyboard focus
KeyboardFocusCoordinator->>MarkdownPanel: focus opened panel
🚥 Pre-merge checks | ✅ 14 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (14 passed)
Full details: Description checkExplanation The description clearly explains the bug, root cause, implementation, preserved behavior, and regression tests. It does not include the template's explicit Demo Video, Review Trigger, or Checklist sections, but the core required change and testing information are present. Full details: Cmux Swift Actor IsolationExplanation PASS. The production diff adds focus behavior to existing UI-isolated types: Full details: Cmux Swift Blocking RuntimeExplanation PASS: The production diff adds no blocking or timing synchronization primitive. Added code uses direct focus calls and an AppKit Full details: Cmux Browser Automation Off-MainExplanation PASS: The policy applies to browser socket automation commands in Full details: Cmux Expensive Synchronous LoadExplanation PASS. The production diff adds focus coordination, WebView attachment callbacks, and a renderer property rename. It does not add or move Full details: Cmux Cache Substitution CorrectnessExplanation PASS — The production diff does not replace a fresh authoritative read with a cache in a persistence, history, undo, or snapshot path. The Full details: Cmux No Hacky SleepsExplanation PASS. The PR changes production code only in Swift files. The only non-Swift change is Xcode project metadata that registers a Swift test file; it adds no sleep, timer, polling, delay, or wall-clock wait. The rule explicitly scopes Swift timing to a separate check, and the added Swift lifecycle callback uses view attachment rather than polling. Full details: Cmux Algorithmic ComplexityExplanation PASS: The production diff adds no nested scalable collection scan or repeated sort/filter. Full details: Cmux Swift ConcurrencyExplanation PASS — The diff adds no background Full details: Cmux Swift `@Concurrent`Explanation PASS: The PR diff introduces no new Full details: Cmux Swift Package BoundariesExplanation PASS. The production diff adds AppKit/WebKit/SwiftUI focus and renderer lifecycle glue in
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… the sidebar Shift-dragging a file from the right-sidebar file explorer into the workspace opens it as a panel, but the drag never resigns the sidebar's first responder and the drop path transfers no keyboard focus, so Cmd+F keeps routing to the sidebar's file search instead of the opened document's find bar.
Two changes, mirroring what the text-drop path already does: Workspace.handleExternalFileDrop now finishes by running the focus coordinator's restoreFocusedPanelFocusFromRightSidebarIfNeeded (via a new AppDelegate wrapper): when the right sidebar owns keyboard focus it releases the sidebar's first responder, flips the coordinator intent to the opened main panel, and restores the panel's focus intent. Drops that do not originate from the sidebar are a no-op. MarkdownPanel.focus() now takes first responder on the rendered preview web view instead of silently no-oping in preview mode, so click-open and tab activation also move the keyboard out of the sidebar, matching terminal and browser panel behavior. The renderer session's web view accessor is renamed findScriptWebView -> webView since it now serves focus as well as find.
Clicking a file row also makes the sidebar outline first responder, and a freshly created markdown panel cannot take first responder during activation (its web view mounts a runloop turn later), so the click-open path had the same Cmd+F misrouting as the drop path. Route both through the shared handoff helper.
The same misrouting existed through every focused open entrypoint (sidebar click, sidebar drag-drop, CLI/socket open, workspace actions): whichever surface owned the keyboard kept it, and when that surface was the right sidebar, Cmd+F kept targeting the sidebar instead of the opened document. Per the shared-behavior policy the handoff now lives in openFileSurfaces (and in the direct split-open branches that bypass it), instead of being duplicated at call sites.
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Inline comments:
In `@cmuxTests/SidebarFileDropFindRoutingTests.swift`:
- Line 101: Add the missing WebKit import to
SidebarFileDropFindRoutingTests.swift before the test uses
WKWebViewConfiguration, leaving the existing MarkdownWebView setup unchanged.
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cmuxTests/SidebarFileDropFindRoutingTests.swift
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The deferred-preview-focus test constructs a WKWebViewConfiguration, and Swift imports are file-scoped, so the test target needs its own WebKit import.
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5 issues found across 10 files
Prompt for AI agents (unresolved issues)
Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.
<file name="Sources/Panels/FilePreviewWorkspaceOpenSupport.swift">
<violation number="1" location="Sources/Panels/FilePreviewWorkspaceOpenSupport.swift:27">
P2: When a focused open targets a non-key main window, this handoff can resolve the wrong window and leave the target sidebar as first responder, so Cmd+F still routes to the sidebar. Resolve and pass the target workspace's owning window instead of falling back to `NSApp.keyWindow`/`mainWindow`.</violation>
</file>
<file name="Sources/Panels/MarkdownPanel.swift">
<violation number="1" location="Sources/Panels/MarkdownPanel.swift:395">
P2: When WebKit installs a descendant as the window’s first responder, this strict identity check treats a successful preview focus as pending. Later content renders then replay `focus()` and steal keyboard focus back from the sidebar or another control. Use the `makeFirstResponder` result, or check responder-chain containment like `BrowserPanel` does.</violation>
<violation number="2" location="Sources/Panels/MarkdownPanel.swift:405">
P2: In preview mode, a pending focus request (`pendingPreviewFocus = true`) is replayed from both `viewDidMoveToWindow` attach and every `onMarkdownRendered` re-render, but the flag is only cleared by panel deselection (`unfocus`), success, or close. If the user opens the panel pre-mount and then moves keyboard focus to a non-panel surface (sidebar search, Cmd+P palette) without de-selecting it, a later file re-render or pane re-attach calls `focus()` and `makeFirstResponder(webView)`, stealing focus from that surface. Consider clearing `pendingPreviewFocus` when focus intent leaves the panel (or gating the replay on the panel still being the active surface) before relying on it going stale.</violation>
</file>
<file name="Sources/Workspace.swift">
<violation number="1" location="Sources/Workspace.swift:12380">
P2: When another main window is key during a file drop, this fallback can select the wrong focus coordinator because Markdown and file-preview panels do not expose their owning window here. Resolve the window from this workspace's owning tab manager before restoring focus, or pass the drop's source/target window explicitly.</violation>
</file>
<file name="cmuxTests/SidebarFileDropFindRoutingTests.swift">
<violation number="1" location="cmuxTests/SidebarFileDropFindRoutingTests.swift:48">
P2: The right-sidebar precondition assertion depends on ambient app state the test never establishes. `MainWindowFocusController.rightSidebarModeOwning` returns `.files` for a responder that `=== rightSidebarHost` only when `fileExplorerState?.mode ?? rememberedRightSidebarMode` equals `.files`, so the `#expect(findShortcutTarget(...) == .rightSidebarFileSearch)` precondition (and the `.mainPanelFind` post-check) silently depend on the freshly created workspace's sidebar happening to be in `.files` mode rather than `.none`/`.find`/`.feed`. That couples the test outcome to unrelated sidebar UI state and can fail or pass for the wrong reason on other runs.</violation>
</file>
Reply with feedback, questions, or to request a fix.
Re-trigger cubic
| // at the coordinator level. No-op when the sidebar does not own | ||
| // focus. | ||
| if shouldFocusNewTabs, let firstPanel = openedPanels.first { | ||
| handKeyboardFocusFromRightSidebarAfterFileOpen(to: firstPanel) |
There was a problem hiding this comment.
P2: When a focused open targets a non-key main window, this handoff can resolve the wrong window and leave the target sidebar as first responder, so Cmd+F still routes to the sidebar. Resolve and pass the target workspace's owning window instead of falling back to NSApp.keyWindow/mainWindow.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At Sources/Panels/FilePreviewWorkspaceOpenSupport.swift, line 27:
<comment>When a focused open targets a non-key main window, this handoff can resolve the wrong window and leave the target sidebar as first responder, so Cmd+F still routes to the sidebar. Resolve and pass the target workspace's owning window instead of falling back to `NSApp.keyWindow`/`mainWindow`.</comment>
<file context>
@@ -14,6 +14,19 @@ extension Workspace {
+ // at the coordinator level. No-op when the sidebar does not own
+ // focus.
+ if shouldFocusNewTabs, let firstPanel = openedPanels.first {
+ handKeyboardFocusFromRightSidebarAfterFileOpen(to: firstPanel)
+ }
+ }
</file context>
| let didBecomeFirstResponder = window.makeFirstResponder(webView) | ||
| && window.firstResponder === webView |
There was a problem hiding this comment.
P2: When WebKit installs a descendant as the window’s first responder, this strict identity check treats a successful preview focus as pending. Later content renders then replay focus() and steal keyboard focus back from the sidebar or another control. Use the makeFirstResponder result, or check responder-chain containment like BrowserPanel does.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At Sources/Panels/MarkdownPanel.swift, line 395:
<comment>When WebKit installs a descendant as the window’s first responder, this strict identity check treats a successful preview focus as pending. Later content renders then replay `focus()` and steal keyboard focus back from the sidebar or another control. Use the `makeFirstResponder` result, or check responder-chain containment like `BrowserPanel` does.</comment>
<file context>
@@ -371,17 +375,43 @@ final class MarkdownPanel: Panel, ObservableObject, FilePreviewTextEditingPanel
+ pendingPreviewFocus = true
+ return
+ }
+ let didBecomeFirstResponder = window.makeFirstResponder(webView)
+ && window.firstResponder === webView
+ pendingPreviewFocus = !didBecomeFirstResponder
</file context>
| let didBecomeFirstResponder = window.makeFirstResponder(webView) | |
| && window.firstResponder === webView | |
| let didBecomeFirstResponder = window.makeFirstResponder(webView) |
| /// panes). | ||
| func handKeyboardFocusFromRightSidebarAfterFileOpen(to panel: any Panel) { | ||
| _ = AppDelegate.shared?.restoreMainPanelKeyboardFocusFromRightSidebar( | ||
| in: activationWindow(for: panel) |
There was a problem hiding this comment.
P2: When another main window is key during a file drop, this fallback can select the wrong focus coordinator because Markdown and file-preview panels do not expose their owning window here. Resolve the window from this workspace's owning tab manager before restoring focus, or pass the drop's source/target window explicitly.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At Sources/Workspace.swift, line 12380:
<comment>When another main window is key during a file drop, this fallback can select the wrong focus coordinator because Markdown and file-preview panels do not expose their owning window here. Resolve the window from this workspace's owning tab manager before restoring focus, or pass the drop's source/target window explicitly.</comment>
<file context>
@@ -12354,10 +12360,27 @@ final class Workspace: Identifiable, ObservableObject, FilePreviewTabMetadataHos
+ /// panes).
+ func handKeyboardFocusFromRightSidebarAfterFileOpen(to panel: any Panel) {
+ _ = AppDelegate.shared?.restoreMainPanelKeyboardFocusFromRightSidebar(
+ in: activationWindow(for: panel)
+ )
+ }
</file context>
| in: activationWindow(for: panel) | |
| in: AppDelegate.shared?.mainWindowContainingWorkspace(id) ?? activationWindow(for: panel) |
| defer { sidebarResponder.removeFromSuperview() } | ||
| sidebarResponder.registerWithKeyboardFocusCoordinatorIfNeeded() | ||
| #expect(window.makeFirstResponder(sidebarResponder), "Expected sidebar responder to take focus") | ||
| #expect( |
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P2: The right-sidebar precondition assertion depends on ambient app state the test never establishes. MainWindowFocusController.rightSidebarModeOwning returns .files for a responder that === rightSidebarHost only when fileExplorerState?.mode ?? rememberedRightSidebarMode equals .files, so the #expect(findShortcutTarget(...) == .rightSidebarFileSearch) precondition (and the .mainPanelFind post-check) silently depend on the freshly created workspace's sidebar happening to be in .files mode rather than .none/.find/.feed. That couples the test outcome to unrelated sidebar UI state and can fail or pass for the wrong reason on other runs.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At cmuxTests/SidebarFileDropFindRoutingTests.swift, line 48:
<comment>The right-sidebar precondition assertion depends on ambient app state the test never establishes. `MainWindowFocusController.rightSidebarModeOwning` returns `.files` for a responder that `=== rightSidebarHost` only when `fileExplorerState?.mode ?? rememberedRightSidebarMode` equals `.files`, so the `#expect(findShortcutTarget(...) == .rightSidebarFileSearch)` precondition (and the `.mainPanelFind` post-check) silently depend on the freshly created workspace's sidebar happening to be in `.files` mode rather than `.none`/`.find`/`.feed`. That couples the test outcome to unrelated sidebar UI state and can fail or pass for the wrong reason on other runs.</comment>
<file context>
@@ -0,0 +1,132 @@
+ defer { sidebarResponder.removeFromSuperview() }
+ sidebarResponder.registerWithKeyboardFocusCoordinatorIfNeeded()
+ #expect(window.makeFirstResponder(sidebarResponder), "Expected sidebar responder to take focus")
+ #expect(
+ focusController.findShortcutTarget(currentResponder: window.firstResponder)
+ == .rightSidebarFileSearch,
</file context>
| /// steal focus after this panel has been unfocused in the meantime. | ||
| func replayPendingPreviewFocusAfterWindowAttach() { | ||
| guard pendingPreviewFocus, displayMode == .preview else { return } | ||
| focus() |
There was a problem hiding this comment.
P2: In preview mode, a pending focus request (pendingPreviewFocus = true) is replayed from both viewDidMoveToWindow attach and every onMarkdownRendered re-render, but the flag is only cleared by panel deselection (unfocus), success, or close. If the user opens the panel pre-mount and then moves keyboard focus to a non-panel surface (sidebar search, Cmd+P palette) without de-selecting it, a later file re-render or pane re-attach calls focus() and makeFirstResponder(webView), stealing focus from that surface. Consider clearing pendingPreviewFocus when focus intent leaves the panel (or gating the replay on the panel still being the active surface) before relying on it going stale.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At Sources/Panels/MarkdownPanel.swift, line 405:
<comment>In preview mode, a pending focus request (`pendingPreviewFocus = true`) is replayed from both `viewDidMoveToWindow` attach and every `onMarkdownRendered` re-render, but the flag is only cleared by panel deselection (`unfocus`), success, or close. If the user opens the panel pre-mount and then moves keyboard focus to a non-panel surface (sidebar search, Cmd+P palette) without de-selecting it, a later file re-render or pane re-attach calls `focus()` and `makeFirstResponder(webView)`, stealing focus from that surface. Consider clearing `pendingPreviewFocus` when focus intent leaves the panel (or gating the replay on the panel still being the active surface) before relying on it going stale.</comment>
<file context>
@@ -371,17 +375,43 @@ final class MarkdownPanel: Panel, ObservableObject, FilePreviewTextEditingPanel
+ /// steal focus after this panel has been unfocused in the meantime.
+ func replayPendingPreviewFocusAfterWindowAttach() {
+ guard pendingPreviewFocus, displayMode == .preview else { return }
+ focus()
}
</file context>
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Follow-up to #11039. Shift-dragging a file from the right-sidebar file explorer into the workspace opens it as a panel, but Cmd+F afterwards still triggered the sidebar's file search instead of the opened document's find bar.
Root cause: the mouse-down that starts the drag makes the sidebar's outline view the window's first responder, a drag session never resigns it, and the panel-open drop path (
Workspace.handleExternalFileDrop→openFileSurfaces) transferred no keyboard focus — unlike the plain text-drop path, which runsfocusPanelAfterSuccessfulPaneDrop.findShortcutTargetchecks the live responder first, so Cmd+F resolved to.rightSidebarFileSearch.MarkdownPanel.focus()compounding it: a silent no-op in preview mode, so even explicit activation never moved the responder.Fix, mirroring the existing release primitive:
Workspace.handleExternalFileDropfinishes by runningrestoreFocusedPanelFocusFromRightSidebarIfNeededfor the drop window (newAppDelegate.restoreMainPanelKeyboardFocusFromRightSidebarwrapper): releases the sidebar's first responder, flips the coordinator intent to the opened panel, restores the panel's focus intent. No-op for drops that do not originate from the sidebar (Finder, pane-to-pane).MarkdownPanel.focus()takes first responder on the rendered preview web view in preview mode (previously text-mode-only), so click-open and tab activation also hand the keyboard over, matching terminal/browser panels.Regression test (red-then-green commits):
SidebarFileDropFindRoutingTestsbuilds the real window harness, makes a registered right-sidebar responder first responder, asserts Cmd+F targets the sidebar, performs the external file drop, and asserts the focused panel is the markdown panel andfindShortcutTargetnow resolves to.mainPanelFind.Summary by cubic
Fixes a follow-up focus bug where opening a file while the right sidebar owned keyboard focus kept the sidebar as first responder, so Cmd+F still routed to the sidebar's file search instead of the opened document's find bar.
Bug Fixes
MarkdownPanel.focus()now takes first responder on the preview web view in preview mode; activation before the WebKit view mounts defers the request until the view attaches to its window.Written for commit d7f9362. Summary will update on new commits.
Summary by CodeRabbit
Bug Fixes
Tests