aduros/flambe — comment on commit e070c1931506564576bd80aa8b0c2cea493e9e87
File: src/flambe/display/MovieSprite.hx line 60
By groves:

It's part of the playhead moving code that currently only exists in the betwixt implementation. If firing a label in goto causes a change to the current frame, _goingToFrame ensures that only the last change is applied and that that change isn't gone to until the current goto completes.