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Rescan icon theme properly

Georges Basile Stavracas Neto requested to merge gbsneto/rescan-icon-cache-properly into master

Quoting the last commit's message:

Whenever an app is installed, the usual routine is
to run 'gtk-update-icon-cache' after installing all
of the app's files.

The side effect of that is that the .desktop file of
the application is installed before the icon theme
is updated. By the time GAppInfoMonitor emits the
'changed' signal, the icon theme is not yet updated,
leading to StIcon use the fallback icon.

Under some circumstances (e.g. on very slow spinning
disks) the app icon is never actually loaded, and we
see the fallback icon forever.

Monitor the icon theme for changes when an app is
installed. Try as many as 6 times before giving up
on detecting an icon theme update.
Edited by Georges Basile Stavracas Neto

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