Update GTK icon cache when installing icons.
Review Request #125192 - Created Sept. 12, 2015 and submitted
Despite the name, Qt is also using this, and it considerably speeds up icon lookup.
Built and installed kdepim, cache files are generated in the expected places.
|Olivier, I was wrong! You can remove the recursive mtime check from Qt, if the rule is always that any ...||David Faure|
Right, sorry for delaying the "ship it" on this one. The discussion derailed into whether Qt should or shouldn't do a recursive mtime check, but this patch in itself is good to go, of course.