Thunderbird - Mouse position is offset from mouse pointer

[shadowfly]

Mouse position is offset from mouse pointer in Thunderbird (mail-client/thunderbird and mail-client/thunderbird-bin and Flatpak affected) - Very similar to https://forums.gentoo.org/viewtopic-t-1167429-highlight-firefox+mouse+position.html.

Roughly two years ago i installed Gentoo for the first time, and Thunderbird (as a Flatpak).
I immediately realized that Thunderbird did not read my mouse pointer position correctly - I had to position my cursor about 20px below a button to actually hit it. However, i ignored the issue as i was not using Thunderbird too often and thought that maybe i installed Gentoo incorrectly.

However i did never learn what i did wrong, and no other Flatpak or native package has ever shown this behaviour to me, (including the Firefox flatpak) so i ask for your help so this can get fixed for me and maybe even others.

What's Wrong?
In the "Main Window" where i can see all E-Mails, and in all other tabs like "Settings", "Calendar", "Tasks" and in the "Search + Window Control Bar" the mouse position Thunderbird recognizes is about 20px above the actual mouse pointer.

I have to point my mouse pointer to (and click) "Settings for Newsbar" to tell Thunderbird to close the window, as the "Close Window Cross" is roughlx 20px over the "Settings for Newsbar" button.
I have to click 1.5 E-Mails below the E-Mail i would like to open.

This problem does not occour in the "New Message" Window where you can write new E-Mails. Somehow everything is fine there.
This problem does not occour in any drop-down menu - Not even in the drop-down Burger Menu in the "Main Window" behind the Ctrl+K search bar.
Work around: Maximizing the window fixes the problem - even when the window is resized again, the mouse position is read correctly.
The problem was temporarily fixed - and then reappeared - between 2024-03 and 2024-05.

Reproducibility:

• Flatpak: I reinstalled Thunderbird and removed the ~/.var/app/org.mozilla.Thunderbird folder - the issue did not go away.
  
• Pre-Compiled (https://packages.gentoo.org/packages/mail-client/thunderbird-bin): I installed Thunderbird for the first time - the issue was there too.
  
• Source Based (https://packages.gentoo.org/packages/mail-client/thunderbird): I removed ~/.mozilla and ~/.thunderbird before the first start - the issue was there too.
  
• Kubuntu: On my Kubuntu Laptop (Kubuntu, X11, KDE Plasma, Thunderbird Flatpak) i could not reproduce this problem.
  
• This problem does not occour in any other program on this system. Not even Firefox.
  
• Someone else has a problem that looks exactly like mine, but for Firefox: https://forums.gentoo.org/viewtopic-t-1167429-highlight-firefox+mouse+position.html. I do not have this problem with Firefox.

System:

• OS: Gentoo Linux 2.15
  
• Windowing System: X11
  
• Desktop Environment: KDE Plasma 5.27.11
  
• Thunderbird 115.10.1

Thank you for your time!

[netfab]

Hi,

Sounds to me to be a gtk problem or mouse theming issue.
So the problem remains even if you delete your ~/{.mozilla,.thunderbird}.
Have you tried with another fresh user on your system (with empty ~) ?

[shadowfly]

Hi there,

I had not tried creating a new user, but now i created a new user using the Plasma System Settings. My (KDE) theme is gone, but the problem remains.
I just tested thunderbird-bin, because the flatpak is not installed system wide.

Tell me when i should test the Flatpak too, or when i should have used the console to create users.

[shadowfly]

I just found something out because i am currently experimenting with Wayland: The problem does not occour on Wayland.
Also: The cursor does not jump when entering the Thunderbird window. Both on X11 and Wayland.

[che]

I have the same issue. One thing I noticed is that the issue is not present i profile selector (-ProfileManager), but kicks in when I open a profile or even start to set up a new one.

After selecting profile, Thunderbird prints out the following log messages:

[shadowfly]

For me, it's a bit different.
When i run Thunderbird with -ProfileManager the ProfileManager is not affected by the mouse pointer bug, just as is yours.