void setConflictDecision(int decision) {
		if (decision == ASK_USER || decision == KEEP_LATEST || decision == KEEP_MY ||
			decision == KEEP_ORIGINAL) {
			if (rmm != null) {
				rmm.setConflictDecision(decision);
			}
		}
		else {
			throw new IllegalArgumentException();
		}
	}
For JUnit testing only, set the option for resolving a conflict.
@param decision ASK_USER, PICK_LATEST, PICK_MY, or PICK_ORIGINAL
Ghidra/Features/Base/src/main/java/ghidra/app/merge/listing/ProgramContextMergeManager.java