void cancelCallback(boolean force) {

		boolean cancel = force;
		if (!force) {
			int choice =
				OptionDialog.showYesNoDialogWithNoAsDefaultButton(null, "Confirm Cancel Merge",
					"Warning!  Cancel causes the entire merge process to be canceled.\n" +
						"Do you want to cancel the Merge Process?");
			cancel = choice == OptionDialog.OPTION_ONE;
		}

		if (cancel) {
			wasCanceled = true;
			MergeManager mergeManager = plugin.getMergeManager();
			if (mergeManager != null) {
				mergeManager.cancel();
			}
		}
	}
Displays the default information in the merge tool.
Ghidra/Features/Base/src/main/java/ghidra/app/merge/MergeManagerProvider.java