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Add menus, Option-click alternates and per-pane overrides to tab bar action buttons - #272
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…action buttons SplitActionButton gains menuBehavior (none/secondary/primary) and an optional alternateAction performed on Option-click. Buttons that use either go through an AppKit overlay that handles click, right-click and press-and-hold; the menu comes from a new delegate callback splitTabBar(_:menuForSplitActionButton:inPane:). Buttons without these fields keep the existing Button and mouse-down paths unchanged. BonsplitController.setSplitButtons(_:forPane:) lets a host show a different button list in one pane's tab bar. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
offersNewTerminal marks a host button whose menu offers a new terminal, so a host that replaces the .newTerminal button with a menu button keeps double-click-to-create-terminal on empty tab bar space. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughSplit-action buttons now support alternate actions, menu behavior, and terminal-menu offers. The controller supports pane-specific button overrides and delegate-provided menus. The tab bar handles menu and mouse interactions, and tests cover configuration, overrides, and interactions. ChangesSplit-action buttons
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
actor User
participant TabBarView
participant BonsplitController
participant BonsplitDelegate
User->>TabBarView: Click or request a split-action menu
TabBarView->>BonsplitController: splitActionMenu(forButton:inPane:)
BonsplitController->>BonsplitDelegate: menuForSplitActionButton(_:inPane:)
BonsplitDelegate-->>BonsplitController: Return optional NSMenu
BonsplitController-->>TabBarView: Return optional NSMenu
TabBarView-->>User: Present an available menu
Suggested reviewers: Merge Risk: 🔵 Low · up to Option-click on a menu-opening button that also has an alternate action opens the menu instead of running the alternate action. This is a narrow gap in a new opt-in feature, and existing buttons are unaffected. It is safe to merge with a small follow-up fix. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The additions are opt-in and reuse the application’s existing action authority. The main design risk is that pending menu interactions can survive changes to their pane or button configuration. Unauthorized execution is not demonstrated, and the effects of application-provided menu actions remain outside this review. Retained concerns
Security review detailsSecurity Blast Radius
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✅ Passed checks (4 passed)
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🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @Sources/Bonsplit/Internal/Views/TabBarView.swift:
- Around line 2181-2183: Update the `.primary` mouse-down handling in
`SplitActionMenuInteractionOverlay` to let Option-click proceed to
alternate-action dispatch when an alternate action is configured; keep an
unmodified click menu-only by continuing to open the menu and return. Pass the
alternate-action availability from the button configuration into the interaction
overlay.
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Sources/Bonsplit/Internal/Models/PaneState.swiftSources/Bonsplit/Internal/Views/TabBarView.swiftSources/Bonsplit/Public/BonsplitConfiguration.swiftSources/Bonsplit/Public/BonsplitController.swiftSources/Bonsplit/Public/BonsplitDelegate.swiftTests/BonsplitTests/SplitActionButtonMenuTests.swift
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…Over The collapsed overflow menu lists a button's Option-click action and its menu, a named Show Menu accessibility action opens the menu under the button, and press-and-hold opens no menu once the pointer has left it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Oct 8, 2026
after merging main, the menu and option-click buttons from #272 built their own view without the half-gap padding, so next to the padded buttons they lost their spacing (and a trailing one moved 2pt right) and had no hover fill. both paths now share one chrome modifier for padding, fill and glyph color. the menu overlay's nsview owns the pointer, so it reports enter and exit from its own tracking area, gated by the bar hover like the plain buttons, and clears it when the view leaves the window.
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cmux wants a compact tab bar action cluster: "+", one split button and a "..." overflow, chosen per pane. Today the trailing action buttons only run one action on click: no menu, no Option-click and no per-pane list.
This adds, all opt-in:
SplitActionButton.menuBehavior:.secondary(click runs the action; right-click or a 0.35 s press-and-hold opens the menu) or.primary(click opens the menu). The host builds the menu through the newBonsplitDelegate.splitTabBar(_:menuForSplitActionButton:inPane:).SplitActionButton.alternateAction: what Option-click runs (split down on a split-right button).SplitActionButton.offersNewTerminal: keeps double-click on empty tab bar space creating a terminal when the plain new-terminal button is replaced by a "+" with a menu.BonsplitController.setSplitButtons(_:forPane:)/splitButtons(forPane:): a per-pane button list; nil keeps the configured default. Setting an equal list is a no-op..primarybutton from the collapsed overflow menu opens its menu at the pointer.Buttons that set none of the new fields keep the existing code paths, and encoding omits the new keys when they are at their defaults. Tests:
Tests/BonsplitTests/SplitActionButtonMenuTests.swift.Used by the cmux change that compacts the pane tab bar actions (cmux-next counterpart: manaflow-ai/cmux#17346).
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Adds menus, Option-click alternates, and per-pane overrides to the tab bar action buttons.
SplitActionButton.menuBehavior(.none/.secondary/.primary) decides whether a click runs the action or opens a host-provided menu, andalternateActionruns on Option-click;.secondaryalso opens the menu on right-click or a 0.35 s press-and-hold while the pointer stays on the button.BonsplitController.setSplitButtons(_:forPane:)lets a host show a different button list per pane; nil falls back to the configured defaults and equal values are no-ops.offersNewTerminalkeeps double-click-on-empty-tab-bar creating a terminal when the plain new-terminal button is replaced with a menu button.Written for commit 8b665b9. Summary will update on new commits.
Summary by CodeRabbit