Backport of "qt6glwindow: Only use GL_READ_FRAMEBUFFER when we do blits" into 1.24
Backport of !7291 (merged) "qt6glwindow: Only use GL_READ_FRAMEBUFFER when we do blits".
Commits:
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d321afcd
qt6glwindow: Only use GL_READ_FRAMEBUFFER when we do blits -
7bd5c507
glframebuffer: Improve error tracing