I've searched it but I only found errors occurring whenever you RESIZE your Minecraft window. This time, as you can see in the attachment below, I am in windowed mode (not fullscreen) and unable to resize the Minecraft window (the "maximize" button is unavailable; I am sorry I can't show it more clear with my cursor, the screenshot function does not recognise it)
EDIT: It only happens when you use F11 to toggle fullscreen!!!
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Dupe of MC-68754