Linked source folder disappears until Eclipse is restarted

[Bestsoft101]

Create a Java Project

Link a source folder

Delete the source folder (The actual folder on the hard drive, not from the project)
Refresh the project

• The folder is no longer displayed in the project
  

Now restore the deleted folder, and refresh the project again

• The source folder should now appear in the project, but it doesn't

Restart eclipse

• The folder is now in the project again

This is quite annoying when working with git, where changing from one branch to another can create or delete folders

[jukzi]

lets narrow it down: do you need a java project for this or does it also happen for a plain project without java nature?

[Bestsoft101]

How do you link a source folder in a non-java project?

[iloveeclipse]

I believe it is a duplicate of eclipse-platform/eclipse.platform#470 and there is a draft PR eclipse-platform/eclipse.platform#473 that unfortunately needs more work.

See eclipse-platform/eclipse.platform#470 (comment) with the explanation what is needed to fix it.