ChangeSet getChangesByOthersSinceCheckout() throws VersionException, IOException {
		synchronized (fileSystem) {
			if (versionedFolderItem != null && folderItem != null && folderItem.isCheckedOut()) {
				return getContentHandler().getChangeSet(versionedFolderItem,
					folderItem.getCheckoutVersion(), versionedFolderItem.getCurrentVersion());
			}
			return null;
		}
	}
Returns changes made to versioned file by others since checkout was performed.
NOTE: This method is unable to cope with version issues which may require an
upgrade.
@return change set or null
@throws VersionException latest version was created with a different version of software
which prevents rapid determination of change set.
@throws IOException if a folder item access error occurs or change set was 
produced by newer version of software and can not be read
Ghidra/Framework/Project/src/main/java/ghidra/framework/data/GhidraFileData.java