1802465 - Missing keyup event with Command key on macOS

Status: RESOLVED DUPLICATE of bug 1299553

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[Pierre Ossman]

Steps to reproduce:

1. Set up event handlers for keydown and keyup
2. Press and release Cmd+.

Actual results:

I got keydown events for Cmd (Meta) and ., followed by keyup event for Cmd (Meta). There was no keyup for ., even though it was released.

Expected results:

I should have got four events; two keydown and two keyup.

Comment 1

[Pierre Ossman]

Attachment: Screenshot 2022-11-25 at 09.27.06.png

Screenshot showing test run using https://w3c.github.io/uievents/tools/key-event-viewer.html.

Problem originally reported to noVNC here:

https://github.com/novnc/noVNC/issues/1695

We've been forced to implement a workaround where we pretend the key is immediately released. This, of course, makes it impossible to do any interaction where it is important to determine that the key is held down.

Comment 2

[Pierre Ossman]

Also note that this is not a system-level issue (like CapsLock), as we know from TigerVNC that these events are sent just fine to the applications.

One guess is that the shortcut code gobbles up all these events, regardless if there is a shortcut bound to that key combination or not.

Comment 3

[Pierre Ossman]

Other browser bug reports:

https://bugs.chromium.org/p/chromium/issues/detail?id=1393524
https://bugs.webkit.org/show_bug.cgi?id=55291

Comment 4

[Alin Ilea, Desktop Test Engineering]

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:107.0) Gecko/20100101 Firefox/107.0

Hi,

I am able to reproduce the issue in release 107, beta 108.0b7 the latest nightly 109.0a1 (2022-11-29) on macOS 10.15.
See also: https://bugzilla.mozilla.org/show_bug.cgi?id=1299553

Thanks for the report.