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calling this function for fullscreen windows won't have any effect (fullscreen windows always grab the cursor)

This is untrue (on Windows, at least). Fullscreen windows don't necessarily automatically grab the cursor; it's free to move onto other screens/displays. Calling the function does cause the cursor to be grabbed though.Basically, it works on fullscreen windows exactly as it does with normal windows so either that text should be changed or there is a bug to be fixedNote that I am talking about actual Fullscreen style, not just large windows.