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Make empty sidebar space a window-drag region - #12162
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Included review availability: Your plan provides up to 10 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughEmpty sidebar areas now support native window dragging. A shared controller tracks single-click movement, preserves ordinary clicks, handles cancellation, and integrates with the sidebar table and clip view. Tests cover drag, pass-through, replay, cancellation, detached views, and first-mouse behavior. ChangesSidebar window dragging
Priority: ➖ Normal — Schedule the empty-sidebar window-drag change because it addresses a medium-severity usability issue while preserving existing sidebar interactions. Estimated code review effort: 3 (Moderate) | ~20 minutes Severity of issue fixed: Medium Merge Risk: 🔵 Low · up to This change enables native window dragging from empty sidebar space while preserving clicks and row interactions. The remaining risk is limited to avoidable test timing sensitivity, which could make validation intermittently unstable. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant SidebarView
participant DragController
participant NSWindow
SidebarView->>DragController: Submit empty-area mouse-down
DragController->>DragController: Track movement and termination events
DragController->>NSWindow: Call performDrag(with:) after threshold
DragController-->>SidebarView: Return drag outcome
Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error)
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Full details: Cmux Swift Blocking RuntimeExplanation The production diff adds a synchronous blocking event loop. Resolution Replace the custom blocking ✨ Finishing Touches🧪 Generate unit tests (beta)
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The empty space below the last workspace group did not move the window when dragged, though the titlebar strip above the sidebar did. macOS users expect background-drag anywhere in a sidebar, and issue #3119 records the non-minimal sidebar as already behaving that way. Track the press synchronously from mouseDown with nextEvent(matching:), the same shape as SidebarDividerTrackingView, rather than through an NSGestureRecognizer. NSWindow.performDrag(with:) runs its own modal tracking loop and consumes the terminating mouse-up, so a recognizer that calls it never receives the event that would drive it back to .possible: it parks in a terminal state, reset() never runs, and it stops recognizing for the rest of the window's life. A press that never travels 4pt is handed back intact - the mouse-up is reposted before falling through, because NSTableView's own mouseDown tracking loop blocks waiting for it. Double-clicks bypass the drag path entirely so doubleClickEmptyArea() still fires, and the table view gates on row(at:) < 0 so rows keep their existing click handling. Fixes #9203
The vertically expanding SidebarEmptyArea is mounted as a full-height background behind the rows in workspaceScrollContent, where a SwiftUI shield sized to the rows stops end-of-list interactions falling through. That shield cannot block an AppKit view, so a representable there would out-hit-test it and turn row presses into window drags. The AppKit sidebar covers this region through the table and clip views, so only the legacy SwiftUI sidebar loses empty-area window drag.
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Inline comments:
In `@cmuxTests/SidebarEmptyAreaWindowDragTests.swift`:
- Line 34: Replace the live system uptime used by the synthetic event timestamp
in the sidebar drag test with a fixed TimeInterval constant such as 1, while
preserving the existing replay assertions.
In `@Sources/Sidebar/SidebarEmptyAreaWindowDragController.swift`:
- Line 23: Remove the injectable nextEvent closure from
SidebarEmptyAreaWindowDragController.init and have the controller call
NSWindow.nextEvent directly for production drag tracking. Extract the
threshold-transition logic into a constructable SwiftPM package type without
AppKit dependencies, then update the test caller to exercise that type instead
of injecting a synthetic event source.
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Sources/Sidebar/AppKitList/SidebarWorkspaceTableClipView.swiftSources/Sidebar/AppKitList/SidebarWorkspaceTableViewImpl.swiftSources/Sidebar/SidebarEmptyAreaWindowDragController.swiftSources/Sidebar/SidebarEmptyAreaWindowDragOutcome.swiftSources/Sidebar/SidebarEmptyAreaWindowDragTrackingEvent.swiftSources/VerticalTabsSidebar+EmptyAreasAndFooter.swiftcmux.xcodeproj/project.pbxprojcmuxTests/SidebarEmptyAreaWindowDragTests.swift
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* Make sidebar empty area a window-drag region The empty space below the last workspace group did not move the window when dragged, though the titlebar strip above the sidebar did. macOS users expect background-drag anywhere in a sidebar, and issue manaflow-ai#3119 records the non-minimal sidebar as already behaving that way. Track the press synchronously from mouseDown with nextEvent(matching:), the same shape as SidebarDividerTrackingView, rather than through an NSGestureRecognizer. NSWindow.performDrag(with:) runs its own modal tracking loop and consumes the terminating mouse-up, so a recognizer that calls it never receives the event that would drive it back to .possible: it parks in a terminal state, reset() never runs, and it stops recognizing for the rest of the window's life. A press that never travels 4pt is handed back intact - the mouse-up is reposted before falling through, because NSTableView's own mouseDown tracking loop blocks waiting for it. Double-clicks bypass the drag path entirely so doubleClickEmptyArea() still fires, and the table view gates on row(at:) < 0 so rows keep their existing click handling. Fixes manaflow-ai#9203 * Keep the full-height sidebar background a SwiftUI hit target The vertically expanding SidebarEmptyArea is mounted as a full-height background behind the rows in workspaceScrollContent, where a SwiftUI shield sized to the rows stops end-of-list interactions falling through. That shield cannot block an AppKit view, so a representable there would out-hit-test it and turn row presses into window drags. The AppKit sidebar covers this region through the table and clip views, so only the legacy SwiftUI sidebar loses empty-area window drag. * Address sidebar window-drag review feedback * Test replayed mouse-up payload * Separate sidebar drag ownership types * Make replay timestamp assertion precision-aware * Eliminate sidebar drag Swift warnings * Remove unreachable SwiftUI sidebar drag bridge * Complete sidebar drag event lifecycle * Split sidebar drag lifecycle types * Clarify sidebar drag event ownership * Test invalid sidebar drag thresholds * Reject invalid sidebar drag thresholds * Gate sidebar drag APIs for older toolchains * Reconcile sidebar drag branch with current main * Keep sidebar drag policy platform-safe * Wire sidebar drag tests as a separate target file * Use deterministic timestamps in sidebar drag tests
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Summary
Fixes #9203. This supersedes the stale fork PR #9212; this PR is authored by austinywang and pushes only to origin.
Verification
Design trade-offs
Localization audit
No new user-facing strings, settings, menus, or shortcuts were added, so no catalog changes were required. The changed Swift files contain no newly introduced user-facing text.
Review history
The stale fork review requests were explicitly checked against this HEAD: the full-height hit-target concern is already fixed, mouse-up replay is tested on both non-drag paths, the controller is constructable with injected event source, detached views do not consume events, and the original mouse-down handoff is intentional per AppKit. New review activity will be answered explicitly.
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Medium Risk
Changes low-level AppKit mouse tracking and event replay in the sidebar; mistakes could break clicks or hang the table, though behavior is covered by dedicated tests and reuses existing window-drag suppression helpers.
Overview
Empty sidebar space below the last row can move the window, similar to the titlebar drag strip. A new
SidebarEmptyAreaWindowDragControllertracks the press synchronously frommouseDown(not a gesture recognizer), startsNSWindow.performDrag(with:)only after 4pt of movement, and reposts the mouse-up when the gesture stays a click soNSTableViewclick/double-click and context menus still work.The AppKit table (
clickedRow < 0) and clip view (presses that miss the table) call the controller for single clicks only; double-clicks still route todoubleClickEmptyArea(). The clip view also accepts first mouse so drags work on inactive windows. The SwiftUI full-height empty-area background is documented as SwiftUI-only so it does not steal native row hit testing—native drags stay on AppKit.Adds outcome/tracking types, Xcode wiring, and six Swift Testing cases (threshold drag, stationary click, sub-threshold jitter, detached view, cancellation, first-mouse).
Reviewed by Cursor Bugbot for commit 9dce176. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by cubic
Makes the empty space below the last sidebar row drag the window, matching the titlebar strip. Previously that space only accepted clicks; now a press that travels past a 4pt threshold moves the window, while stationary clicks and double-clicks keep their existing behavior. Fixes #9203 and supersedes the stale fork PR #9212.
NSTableViewfinishes its click tracking, andperformDrag(with:)receives the original mouse-down per AppKit's contract.Written for commit 9dce176. Summary will update on new commits.
Summary by CodeRabbit
New Features
Bug Fixes