Use new dock system for SpriteFrames Dock #113275
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+27
−19
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See #113024
This PR updates the SpriteFrames docks to use the new dock system. The layout is very horizontal but with some changes, it seems possible to make it vertical. That can be done in a follow-up PR.
This PR also contains a fix for transient docks, where it would be opened if the layout was saved while it was floating, leading to crash cases where the dock knew it wasn't editing anything, but it was able to be opened by loading the layout, so it was unsafely accessing the nullptr.