undo_state
undo_state UndoState(bool* isRedo) const;
undo_state undoState = B_UNDO_UNAVAILABLE;
undo_state undoState = B_UNDO_UNAVAILABLE;
undo_state state = textView->UndoState(&isRedo);
undo_state
undo_state state = UndoState(&isRedo);
BTextView::UndoBuffer::UndoBuffer(BTextView* textView, undo_state state)
undo_state
UndoBuffer(BTextView* view, undo_state state);
undo_state State(bool* _isRedo) const;
undo_state fState;