Undo/redo system #1644
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Undo/redo system #1644
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Also fixes potential issue where mSelectionRect would be expanded, even if YesOrNo is false.
This is done automatically in the QObject destructor. Calling it here could potentially mess up code it we ever use the destroyed() signal for this object.
Mostly this was just refactoring to remove the redundant code between functions, but it also makes minor functional changes which will hopefully not affect anything: - Empty sound frames are now overridden - The current layer is not changed if adding the new keyframe was unsuccessful - currentLayerChanged(), frameModified(), and animationLengthChanged() will now be emitted
More refactoring, with the following functional changes: - deselectAll is called before removing frame with removeKeyAtLayerId - currentLayerChanged(), frameModified(), and animationLengthChanged() is emitted even if the layer isn't changed with removeKeyAtId - Case where no layer with id layerId is caught
Undo redo manager batch 1
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Derived from #953, this PR seeks to integrate as little as possible, so that we can focus on the manager and element classes and then merge those when we find the manager ready.
To ensure even greater success with this it would also be a good idea to write tests for each backup element, so that we can verify that the implementations work as expected.
I have not verified that the backup logic still works but considering I haven't touched it in a long time and it worked the last time I worked on it.. I would expect it to still work.