synchronized public boolean isCancelled() {
		return cancelled;
	}
Returns whether the last <CODE>getDifferences</CODE> call was cancelled.
If a TaskMonitor displays a progress dialog to the user, then the cancel
button could have been pressed.
@return true if the last <CODE>getDifferences</CODE> call was cancelled.
Ghidra/Features/Base/src/main/java/ghidra/program/util/ProgramDiff.java