https://bugs.kde.org/show_bug.cgi?id=505895

            Bug ID: 505895
           Summary: Full screen videos in Firefox are placed incorrectly
                    on multi-monitor setups.
    Classification: Plasma
           Product: kwin
      Version First 6.4.0
       Reported In:
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: kdeb...@thewalkingglitch.com
  Target Milestone: ---

Created attachment 182471
  --> https://bugs.kde.org/attachment.cgi?id=182471&action=edit
Monitor layout configuration.

SUMMARY
Full screen videos in Firefox are placed incorrectly on multi-monitor setups.

STEPS TO REPRODUCE
1. Open a video with Firefox.
2. Place the Firefox window on your side monitor in vertical orientation.
3. Set the video to full screen.

OBSERVED RESULT
The full screen video is placed partially off the bottom of the vertical
monitor. 

EXPECTED RESULT
The video should render centered on the vertical monitor.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.14.11-300.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800X3D 8-Core Processor
Memory: 128 GiB of RAM (127.0 GiB usable)
Graphics Processor: AMD Radeon RX 6900 XT

ADDITIONAL INFORMATION
I have a multi-monitor setup with 2 4k monitors. The main is landscape, and the
secondary is in portrait off to the right. I have attached a screenshot to
illustrate my exact setup.

This worked correctly in the last version of 6.3. This regression happened in
the 6.4 update.

I suspect it has something to do with my screen offsets. It seems the video
ends up centered on the bottom of my primary monitor, despite being on the
vertical secondary. I would look into this further, but getting the offset set
correctly again is very tedious.

Chromium and VLC seem immune to this issue.

I am unsure of which component is responsible for this behavior, so I have
marked it kwin/generic.

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