After minimising a Writer file, I can't retrieve it from the launcher, or Alt-Tab to Writer. It will open up Spotify again.

This is essentially the same problem as the "Minimize window broken" post.

Basically I can't use Writer for the present, so it's a major inconvenience.

I have done a cold boot, which hasn't fixed it. I've got 20.04 regular Ubuntu.

I know I have to look for bug reports next, so I'll have to work that out.

Grateful for any tips!