Remove All Gaps Alters Visuals for Clips with Overlapping Positions

[Seandagan]

**Proposed fix **
#5694

Describe the bug:
When using the Remove All Gaps operation on multiple clips that share the same position after a gap (referred to as overlapping clips), one of the clips in the group is moved to close the gap. This behaviour alters the visual arrangement of the timeline, even though the total duration remains unchanged.

Steps to reproduce the behavior:

1. Create multiple clips with overlapping start positions after a gap.
2. Use the Remove All Gaps operation.
3. Observe that one clip is moved to close the gap, disrupting the visual alignment of the timeline.

Expected behavior:
The Remove All Gaps operation should preserve the visual alignment of overlapping clips while closing gaps.

System Details:
INFO app: ------------------------------------------------
INFO app: OpenShot (version 3.3.0)
INFO app: ------------------------------------------------
INFO app: openshot-qt version: 3.3.0
INFO app: libopenshot version: 0.4.0

Log Files:
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[Colorjet3]

Hello @Seandagan I am able to replicate this in my environment as well (Windows 11 and OpenShot v3.3.0). I'll mark this as a bug and submit it to the queue for the lead developer to review and fix. No ETA.

By the way, a workaround for now is to right click on the Gap and select "Remove Gap" and things will shift correctly. If you can try that and confirm that would be great.

[Seandagan]

Hello @Colorjet3 @jonoomph

About the workaround, removing single gap did shift multiple clips correctly keeping same position to multiple clips.
My proposed fix 5694 fix the bug also in a case that there are many gaps and many pairs of clips with same position requiring one user operation.