Ask for installing libgxps2 if user tries to open XPS document.
Submitted by Daniel Preston
Link to original bug (#687152)
Description
Currently if libgxps2 is not installed and you try to open XPS file, Evince shows error about being unable to open zip archive. Very unhelpful.
Instead it should show info like "Evince can't open XPS files if libgxps2 is not installed". It's trivial but important, because "normal" use would just give up thinking Evince doesn't support XPS.
Version: 3.4.x