https://bugs.kde.org/show_bug.cgi?id=435692

            Bug ID: 435692
           Summary: Overlapping text after changing subtitles in preview
                    zone
           Product: kdenlive
           Version: 20.12.3
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Video Display & Export
          Assignee: j...@kdenlive.org
          Reporter: b0ac3c4f9fcb_...@2.71828.eu
  Target Milestone: ---

SUMMARY
Changing a subtitle in a preview zone after Preview Render has completed leads
to the original and changed subtitle texts overlapping.

STEPS TO REPRODUCE
1. Create a new project.
2. Add a preview zone.
3. Within the preview zone, add a subtitle, for example "original text".
4. Start Preview Render, wait until it is done.
5. Change the subtitle, for example to "new text".
6. Play the video in the Project Monitor.

OBSERVED RESULT
Both subtitles are shown in the project monitor.
In the example, both "original text" and "new text" are shown, one overlapping
the other.

EXPECTED RESULT
Only the changed subtitle text is shown.

SOFTWARE/OS VERSIONS
OS: Linux (x86_64) release 5.11.13-arch1-1
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2 (built against 5.15.2)

ADDITIONAL INFORMATION
- On changing the subtitle, the Preview Zone is not invalidated (i.e. does not
change from green to red).
- Re-starting the Preview Render after step 5 does not change anything.
Workaround: Remove the preview zone, add it again, and rerender.

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