Karol Kosek 848c4fc43d LibGUI: Show an error message box in the FilePicker on no permissions ...

The first attempt in #9037 used a special label as a view, if it wanted
to communicate any kind of error, but that sure did look a bit ugly.

Here, we are just showing a message box right before setting the new
path as:
- the contents of the previous directory will be visible in background,
  which I find pretty nice, and
- I don't have to deal with adding a path history vector to reopen
  the previous directory (which might not even exist then). :^)

2021-09-01 23:01:18 +02:00

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