https://bugs.kde.org/show_bug.cgi?id=480734

            Bug ID: 480734
           Summary: Sequence background lose transparency, if sequence tab
                    closed before saving project
    Classification: Applications
           Product: kdenlive
           Version: git-master
          Platform: Compiled Sources
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Video Display & Export
          Assignee: j...@kdenlive.org
          Reporter: jijili...@yandex.com
  Target Milestone: ---

Created attachment 165473
  --> https://bugs.kde.org/attachment.cgi?id=165473&action=edit
project_seq-lose-transparency-bg

SUMMARY
If you close a sequence's tab (which has been added into another sequence's
track), then save the project, close, reopen it, you'll find the sequence is
rendered black-background (transparency lost)
(watch the screen-record video I upload)

STEPS TO REPRODUCE
1. Create project
2. Create title clip, with text, transparent background. Add it to Sequence 1
3. Create Sequence 2
4. Close Sequence 1 tab
5. Add a picture to Sequence 2 V1
6. Add Sequence 1 to Sequence 2 V2, above V1 picture (currently, the background
of Sequence 1 is transparent)
7. Save, close, reopen

OBSERVED RESULT
After close and reopen, Sequence 1's background is rendered black in Sequence 2

EXPECTED RESULT
Sequence 1's background should be rendered transparent in Sequence 2

SOFTWARE/OS VERSIONS
Latest git master build (qt5) kdenlive-master-7360-linux-gcc-x86_64.AppImage

ADDITIONAL INFORMATION
1. If you export video after reopen saved project, the exported video also have
a wrong-rendered Sequence 1 black background
2. If you open Sequence 1's tab, then switch to Sequence 2, the background
transparency comes back

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