[scene] Discard pixmaps on buffer size change
The surface size is a logical size, which renders it unsuitable for deciding whether the window pixmap needs to be discarded. We need to discard window pixmaps when the buffer size changes. That has a drawback though, discarding textures is kind of an overkill with linux-dmabuf. However, fixing that would involve changes in kwayland server that are far from being trivial. BUG: 422459
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