You seem to have CSS turned off.
Please don't fill out this field.
"undo" can undo too much. Example: make a change in a transition such as edit a line of code, then paste some text, then edit a line incorrectly and hit undo and all these are gone unless save is used in between. Save often. Redo may or may not bring them back.
in QM 3.3 you can't undo/redo anything in the property editor. So even if you focus the propertsy editor undo/redo will affect the last cahnges in an editor windows.
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