I’m seeing a reproducible title-bar interaction issue on macOS 27 RC (26A428). This issue has been present since at least macOS 27 build 26A5416b (Developer Beta 6 / Public Beta 4) and is still reproducible on the Release Candidate, build 26A428.
My System Settings → Desktop & Dock → Window title bar double-click action is configured to Fill.
In several system apps with sidebars, including:
- Finder
- System Settings
- Reminders
- Feedback Assistant
the right side of the title bar shows a visible rectangular region when the pointer hovers over it.
The more important problem is that the middle portion of this region appears to intercept the title-bar double-click. Double-clicking there does nothing, while double-clicking very close to the top or bottom edge of the same region correctly triggers Fill.
This makes the normal title-bar gesture surprisingly difficult to use because the center of the title bar is naturally where I would double-click.
Interestingly, the sidebar area does not have this problem: double-clicking the top, middle, or bottom portions of the sidebar title-bar area all works normally.
Feedback Assistant makes the behavior particularly easy to see because its left sidebar and rightmost pane behave normally, while the title-bar region above the middle pane exhibits the problem.
Steps to reproduce:
- Set “Double-click a window’s title bar” to Fill in Desktop & Dock settings.
- Open Finder, System Settings, Reminders, or Feedback Assistant.
- Move the pointer over the right/content portion of the title bar until the rectangular hover region appears.
- Double-click around the center of that region.
- The Fill action does not occur.
- Double-click very close to the upper or lower edge of the same region.
- Fill works normally.
I have reproduced this on macOS 27 RC build 26A428, including:
- a newly created macOS user account
- Safe Mode
so it does not appear to be caused by migrated preferences, caches, login items, or third-party software.
A screen recording demonstrating the exact hit-testing behavior was submitted through Feedback Assistant.
Feedback: FB24462749
Is anyone else able to reproduce this? It looks as though some view or overlay in the new title-bar/toolbar area may be intercepting mouse events.
Thank you for the bug and the attached screen recording.
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Albert WWDR
