Andreas Kling ff912946ae LibGUI: Support merging of adjacent commands on the UndoStack ...

When pushing a new command on an undo stack, we will now attempt to
merge it into the stack's current command.

Merging is implemented by overriding the "merge_with(Command const&)"
virtual on GUI::Command. :^)

2021-05-08 22:17:50 +02:00

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