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Bug 1773943

Summary: Drop down menu in Firefox does not correctly work on multiple screen setup.
Product: [Fedora] Fedora Reporter: Lukas Ruzicka <lruzicka>
Component: firefoxAssignee: Jan Horak <jhorak>
Status: CLOSED DUPLICATE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: unspecified    
Version: 31CC: 0xalen+redhat, anto.trande, gecko-bugs-nobody, jhorak, john.j5live, kengert, pjasicek, rhughes, rstrode, sandmann, stransky
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Hardware: x86_64   
OS: Linux   
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Last Closed: 2019-11-20 14:56:55 UTC Type: Bug
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Bug Blocks: 1054334    

Description Lukas Ruzicka 2019-11-19 11:26:49 UTC 
Description of problem:

I am using the most recent versions of Gnome (Wayland) and Firefox on a three screen set-up and whenever I want to use a drop down menu on a web page, it does not correctly work -> it gets focus after clicking on it, but it never opens to let me select from the options. I know for sure that there are options on it.

In Firefox, the drop-down menu only works when the Firefox window is placed on the leftmost screen. I think that it does not have to be the leftmost, or the rightmost, but it probably is the one that registers first into the Wayland session. Drop-down menus work correctly on one screen setup (laptop screen). There is also no difference between a maximized and non-maximized window, drop-down works on one of the screens only.

Google Chrome works normally on any screen.

After switching to Xorg, Firefox behaves normally on all of the three screens.

Version-Release number of selected component (if applicable):

Firefox: 70.0.1-4
Gnome Shell: 3.34.1-4

How reproducible:

Always

Steps to Reproduce:
1. Run a setup with one primary and one secondary screen.
2. Navigate to https://docs.python.org/3/contents.html and try drop-downs in the upper-left corner.

Actual results:

They do not work except on one of the screens.

Expected results:

They should work everywhere.

Additional info:

Interestingly, on the Bootstrap page, https://getbootstrap.com/docs/4.3/components/dropdowns/, everything works as expected on each screen.
Comment 1 Martin Stransky 2019-11-19 11:36:00 UTC 
Jan, can you please look at it? Thanks.
Comment 2 Jan Horak 2019-11-20 14:56:55 UTC 

*** This bug has been marked as a duplicate of bug 1773715 ***