protected void checkFilesInUse() {
		// NOTE: In-use check is currently limited to files open for update but for the purpose of 
		// maintaining a checkout should really correspond to any file use (e.g., open read-only
		// with DomainFileProxy).
		filesInUse = false;
		for (DomainFile df : list) {
			if (df.getConsumers().size() > 0) {
				filesInUse = true;
				return;
			}
		}
	}
Sets the filesInUse field if any file is in use.
Call this method from the run() method so that the
"Keep checked out" checkbox on the dialog is disabled if files
are still in use.
Ghidra/Framework/Project/src/main/java/ghidra/framework/main/datatree/VersionControlTask.java