Andreas Kling ee19f7c0aa LibGUI: Use UndoStack::on_state_change inside TextDocument/TextEditor ...

Have TextDocument listen for state changes on the internal undo stack,
and forward those to all clients via a new virtual function.

This simplifies updating the can_undo / can_redo states of TextEditor.

2021-05-08 13:49:34 +02:00

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