[scribus] image files scribus 1.5.7 linux mint

[Peter Roosenboom]

I have a problem when opening an image frame to get an image: the 
directory only shows .png images. The drop down menu: all supported 
formats only shows all supported formats and all files and a lot of 
empty space between them. When I open all files all formats are visible 
and I can choose them and use them.

Scribus 1.5.7 is a flatpak installation on Linux mint 20.1 64b Cinnamon. 
BTW I had the same problem with scribus 1.5.6

Peter