Snap: initialize db and icons for faster startup and remove fonts #2715
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In order to improve the startup time for snapped applications we can generate the mime DB and the icon caches at snap build time. In order to do this, we can use snap composition to override the desktop-gtk{2,3} part, adding an install script which does this.
The remote part can't do this by default since it could break legacy applications providing such files but this won't be the case for electron apps.
At the same time, fonts can be removed if a desktop plug is required since
/usr/share/fonts
will be bind-mounted from system.