https://bugs.kde.org/show_bug.cgi?id=394457

            Bug ID: 394457
           Summary: Part of clip treated with alpha generator effect is
                    not visible when resized
           Product: kdenlive
           Version: 17.12.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Effects & Transitions
          Assignee: vpi...@kde.org
          Reporter: satgirl2...@narya.net
  Target Milestone: ---

Overview: 

Part of clip treated with alpha generator not visible when resized.

Steps to Reproduce:

1. Put a clip over another clip so the bottom clip overhangs and is seen first
on the project manager.
2. Treat the top clip with effects, alpha manipulation, alpha generator
3. Grab the edge of the top clip with the mouse and resize it so that it
overhands the bottom clip and comes first.

Actual Results: 

Although the top clip has been changed in length so that it should begin
playing first, there is no image on the project manager where the viewer says
that the clip should be playing. You can hear the sound of the clip playing.

When it crosses the lower video, the lower video is visible and both clips can
be heard playing.

Video only appears split screen at the location where it was when the alpha
gradient was set.

Expected results:

Resizing the top clip to be longer should apply the alpha gradient to the
entire clip.



Build Date & Platform:

Version 4:17.12.3-Oubuntu1


Additional Information: 

Error persisted after save and reload.

Error rendered incorrectly. Video generated looked the same as project manager.

First noticed when an error caused system to crash twice, (second time with
memory error) alpha generator was in combination with speed and mirror.

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