Folder and files no longer visible in editor

This is odd. Earlier today my web socket app was running, I didn’t boost it yet. Now I see the project but the /built folder (that contains the JS files) is not visible. It is there in terminal window and I can list the filenames and even the files.

I did type refresh. I can see some entries in the log which tells me it is running.

I couldn’t wait to find out what might have happened so I restored from GitHub and the folder and files are visible again. I will see if they remain that way.