Middle Clicking on Tab on MacOS Should Close it!

[rayhanadev]

It would be great to support middle-click-to-close for tabs on macOS when macos-titlebar-style = tabs is enabled.

This behavior already exists on GTK via PR #1077, and having the same interaction on macOS would be a nice quality-of-life improvement!

Why this is useful:

• Common and intuitive tab behavior across many apps
• Faster than targeting the close button, especially with many tabs
• Improves parity between platforms

Expected behavior:

• Middle-clicking directly on a tab closes that tab
• Uses the same close semantics as the existing close button

Current behavior:

• Middle-clicking a tab does nothing

Notes:

• GTK implements this by handling the middle mouse button on the tab UI
• I’m hoping a similar hook is possible on macOS
• Already exploring an implementation on a fork, happy to contribute upstream! :)

[jcollie]

#11962