It is necessary to properly initialize the icon loader in all case.
Otherwise some calls might give wrong results if a platform theme plugin
is involved.
For instance, we might miss the actual theme name reported by the
platform theme, eg it's what happen with QStyle::standardPixmap if no
one created a QIcon before its first call.
Also clean up the accesses to the global static and have only
QIconLoader::instance() use it. All other call go through the static
method. This way only instance() needs to call ensureInitialized(),
definitely safer and looks cleaner to me.
Change-Id: Id3ea6816edd5a65586004f69464960abc3602cf8
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
aa5f70c00a