1871041 - macOS: resizing window by keyboard causes window to immediately bounce back

Status: RESOLVED DUPLICATE of bug 1806374

(Core :: Widget: Cocoa, defect)

Description

[Mauro]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.0) Gecko/20100101 Firefox/121.0

Steps to reproduce:

1. set up a keyboard shortcut in macOS "System Settings" -> Keyboard -> Keyboard Shortcuts... -> App Shortcuts. Map "Move Window to Left Side of Screen" to e.g. "cmd-alt-1"
2. Switch to Firfox and press the shortcut on your keyboard.

Actual results:

Window moves and resizes correctly to the left side of the screen, but immediately bounces back to the previous position and size (both directions are animated).

Expected results:

The window should not bounce back.

seems I'm not the only one with this problem: https://connect.mozilla.org/t5/discussions/firefox-behaving-weirdly-on-mac-for-move-window-to-sode-of/m-p/22817/thread-id/9455

Interestingly, resizing the window by using the mouse and clicking the relevant menu entry works correctly. Also it works for some keyboard shortcuts (like ctrl-option-1 or cmd-option-w) but doesn't for others (like cmd-option-q). I can see no pattern though, it's not like there is an action bound to those that don't work...

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Cocoa' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.