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LibGUI: Add UndoStack::{undo,redo}_action_text()
These return the action_text() for the current undo and redo commands, if available.
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@ -30,6 +30,9 @@ public:
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void clear();
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Optional<String> undo_action_text() const;
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Optional<String> redo_action_text() const;
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Function<void()> on_state_change;
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private:
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