https://bugs.kde.org/show_bug.cgi?id=430734

            Bug ID: 430734
           Summary: Increasing preview resolution glitches out preview
                    when GPU processing is enabled
           Product: kdenlive
           Version: 20.12.0
          Platform: Flatpak
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: User Interface
          Assignee: j...@kdenlive.org
          Reporter: firlaevhans.fi...@protonmail.com
  Target Milestone: ---

I'm using the latest kdenlive 20.12 flatpak. I was playing around with GPU
processing. My preview resolution was set to 540p (I was also using proxys, but
disabling them made no difference). When I changed the preview resolution to
1:1 (1080p), the preview window looked zoomed in with weird artifacts.
Using an AMD RX580 with Mesa 20.2.3 btw.

STEPS TO REPRODUCE
1. Set the playback resolution to less than 1:1 (in my case 540p)
2. Enable Movit GPU processing
3. After that, change the playback resolution to something bigger (1:1)

OBSERVED RESULT
Preview glitches out with artifacts until Kdenlive is restarted

EXPECTED RESULT
Playback resolution changes like normal

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