Sets start for the element.
If the element has a parent, this will also move its siblings with the same shift.
Whilst the element is part of a Timeline, this is the same as editing the element with edit under NORMAL with NONE. In particular, the start of the element may be snapped to a different timeline time from the one given. In addition, setting may fail if it would place the timeline in an unsupported configuration.
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| start |
The desired start position of the element in its timeline |
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true if |