Remove merge_undo
from undo code.
#1999
Merged
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Fixes #1515. Also removes a no-longer used
history
trait.This completes the transition of TraitsUI undo/redo to share the same basis as the Pyface/Apptools undo/redo.
There is still an issue in #1060 that is unresolved which is about refactoring TraitsUI to be more command-stack based, rather than building the command stack reactively.
Checklist