@Override
	protected void cleanupMerge() {
		mergePanel.dispose();
		mergePanel = null;
	}
Returns one of the four programs involved in the merge as indicated by the version.

@param version the program version to return. (LATEST, MY, ORIGINAL, or RESULT).
@return the indicated program version or null if a valid version isn't specified.
@see MergeConstants
Ghidra/Features/Base/src/main/java/ghidra/app/merge/ProgramMultiUserMergeManager.java