[kdenlive] [Bug 461655] New: "extract timeline zone" does not effects subtitles

[Balázs Kelemen]

https://bugs.kde.org/show_bug.cgi?id=461655

            Bug ID: 461655
           Summary: "extract timeline zone"  does not effects subtitles
    Classification: Applications
           Product: kdenlive
           Version: 22.08.2
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: User Interface
          Assignee: jb at kdenlive.org
          Reporter: prampec+kde at gmail.com
  Target Milestone: ---

SUMMARY
Context: Function "extract timeline zone" (Shift-X) removes a time zone
selected by the Set-Zone-In, Set-Zone-Out tool. All tracks are effected by this
removal and right side clips shift to left with the effected frames.
Bug: All tracks are effected but the subtitles track, where subtitles does not
shifts with the removal. They loosing sync with this operation.


STEPS TO REPRODUCE
1. Prepare a track with a clip.
2. Add a subtitle(s) matching a specific part of the clip content (but not to
the very beginning to the clip).
3. Select a time-zone left to the subtitle.
4. Apply "extract timeline zone" (Shift-X) tool.

OBSERVED RESULT
The some frames are removed from the clip and right side joins the left side by
shifting to left, but the subtitle(s) does not do the shift, thus getting out
of sync. The subtitle appears in a later position than it was intended to be.

EXPECTED RESULT
The subtitle should be handled as a separate track, and "extract timeline zone"
should effect that track as well. And in this manner the removal should make
subtitle(s) on the right to shift left accordingly and keep in sync with the
other track(s).

SOFTWARE/OS VERSIONS
macOS: 11.7

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