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plugins/screencast: Allocate offscreen texture in...

Vlad Zahorodnii requested to merge work/zzag/backport-screencast-crash-fix into Plasma/6.1

plugins/screencast: Allocate offscreen texture in WindowScreenCastSource::render(QImage) as big as the memfd buffer

textureSize() can temporarily mismatch the target buffer size. It can be a problem if glGetTexImage() gets called. glGetTexImage() assumes that the provided buffer is as big as the texture. If it's not, it will write data outside the bounds of the buffer.

BUG: 489764 (cherry picked from commit a6743fd2)

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