Replace X-AppInstall-Ignore by X-AppStream-Ignore in .desktop file

[Laurent Bigonville]

Hi,

The X-AppInstall-Ignore key in the desktop file should be replaced by X-AppStream-Ignore now that debian supports Dep11 (https://wiki.debian.org/DEP-11) and that apparently ubuntu will switch to it too. That means that app-install will not be used anymore.

Maybe as a transitional phase both should be present.

[Matthias Klumpp (ximion)]

Just FTR, it's also possible to have both tags present, but if/when Ubuntu switches to AppStream with the Xenial release, it's not necessary anymore to keep the old field around (in fact, I didn't even know that app-install had such a field - I'm still against parsing it though, since that would mean we don't push projects to use the more generic tag which is also parsed by other distros).

Details can be found at https://wiki.debian.org/AppStream/Guidelines#hints-exclude-desktopapp

[Michael Terry (mterry)]

Our .desktop file story should be cleaner these days. We no longer use any X-AppStream-Ignore keys.