void setConflictDecision(int decision) {
		if (decision < CANCELED || decision > KEEP_ALL) {
			throw new IllegalArgumentException();
		}
		conflictOption = decision;
	}
For JUnit testing only, set the option for resolving a conflict.
@param decision CANCELED, ASK_USER, PICK_LATEST, PICK_MY, PICK_ORIGINAL
Ghidra/Features/Base/src/main/java/ghidra/app/merge/listing/ListingMergeManager.java