desktop-file-validate returned the following:
xpra_launcher.desktop: error: value "Network" for string list key "Categories" in group "Desktop Entry" does not have a semicolon (';') as trailing character
Trivial to fix as follows:
-Categories=Network +Categories=Network;
Thank you.
applied in r1312 - thanks!
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/174