private void queueNextFiles() {
			if (nextFolder == null && !folderQueue.isEmpty()) {
				nextFolder = folderQueue.poll();
				DomainFolder[] folders = nextFolder.getFolders();
				for (int i = folders.length - 1; i >= 0; i--) {
					DomainFolder subfolder = folders[i];
					folderQueue.addFirst(subfolder);
				}
			}
		}
Recursively traverse the {@link DomainFolder}s under a specific {@link DomainFolder}.

@param startFolder
Ghidra/Framework/Project/src/main/java/ghidra/framework/model/ProjectDataUtils.java