Feature request (a small UI enhancement): when the path field is uneditable, say why

A user who has selected 'Edit Folder' might reasonably expect to be able to edit the folder path. Yet, one cannot do that. The path is greyed out. That is some indication that one cannot edit the path, and, yet, one is within the 'edit folder' option. So how about adding text that says that the path is uneditable? The window already shows a note about the path - see this screenshot:

The ideal text for the note, it seems to me, would be something like this: 'The path is editable only when the folder is first added to Syncthing.'

The problem that such a note would solve: user confusion.

Alternative ways of solving that problem: one could put something in the documentation (if the existing documentation extends to the GUI - does it?); but having explanation within the GUI itself is better.

Find the Edit Folder window and the existing note about the path shown in the issue’s screenshot. Review how the disabled path field and its note are rendered, then add the proposed explanation so users understand why the path cannot be edited; verify the note appears in that window.