Fix slow scrolling when hidden files or symbolic links are shown
The problem was that we drawed the overlays using KIconLoader, which can be very slow, every time an item appeared on the screen. This commit makes sure that not only the icon, but the icon including overlays is cached in QPixmapCache. Therefore, the overlay drawing is done just once for each icon+overlays combination. For previews, the overlay drawing is done in KFileItemModelRolesUpdater just after the preview is received. BUG: 310662 BUG: 314339 FIXED-IN: 4.11.1 REVIEW: 111956
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