[RFE] allow xdg-mime to set defaults "for all subtypes"
For example, there's countless number of file types under the
text/x-c++, etc. No way one would be able to cover every one of them manually, it would be great if
xdg-mime default … instead would allow sort of shell expansion
text/* (though I assume
* may be a valid symbol, it's just an example, maybe a command line option would solve that).