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Avoid discarding previous pixmap

Vlad Zahorodnii requested to merge work/avoid-discarding-previous-pixmap into Plasma/5.22

When resizing, the SurfaceItem will discard the current pixmap until a new one is created. If the newly created pixmap is valid, the previous pixmap will be discarded in SurfaceItem::updatePixmap().

However, the previous pixmap can be discarded only if it's unreferenced, in other words, no effect needs the previous pixmap.

BUG: 439689

Edited by Vlad Zahorodnii

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