Changes: Clear the pixmap cache when the window is not shown on the display anymore or has been minimized.
Changes: Clear the pixmap cache when the window is not shown on the display anymore or has been minimized.

RevBy: Armin Berres

Details: Widgets like MScalableImage and MLabel (when showing rich-texts) use QPixmapCache for the caching of pixmaps. If the window gets invisible or has been minimized there is no need to keep the pixmaps in the cache.

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