https://bugs.kde.org/show_bug.cgi?id=366416

            Bug ID: 366416
           Summary: Speed Effect on cropped clip can mess up the timeline
           Product: kdenlive
           Version: 16.04.0
          Platform: Other
               URL: https://www.youtube.com/watch?v=ElvrAlIOEHQ
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Effects & Transitions
          Assignee: vpi...@kde.org
          Reporter: ch...@8bit-memories.com

If you have a CROPPED video clip (i.e. cut part of the ending) and apply the
speed effect to it, depending on the setting of the speed, this clip may
overlap another clip on the same video track. 
Saving and Reloading the project in this state will mess up the timeline.
However even working on the project as this overlap happens can yield some
rather random results (and/or a crash).

Reproducible: Always

Steps to Reproduce:
1. Make a new project with at least two video clips of any length.
2. Add the first clip to VIDEO 1 and crop part of its end.
3. Add the second clip on the same track (VIDEO 1) right after the first
4. Apply a SPEED EFFECT to the first video track.
5. Drag the speed slider around until the video clip will eventually overlap
the following one. This may be tricky and requires some playing around with the
speed slider.
6. After both clips overlap each other, save the project (the project is
already messed up at this point and kdenlive may not play the second clip if
playing the project or even crash)
7. Load your project again and see how the second video clip is pushed back.

Actual Results:  
The second video clip is pushed back in the timeline. But only after the
project reloads.

Expected Results:  
As it happend if the first video clip is NOT cropped, kdenlive will
automatically crop it so it cannot overlap the following clip.

This bug ONLY WORKS if you crop the end of the clip BEFORE you apply the speed
effect to it.

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