Improved Window.flip
error message when no surface is associated with the Window
#2633
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Previously the error message would have been
"Window surface is invalid, please call SDL_GetWindowSurface() to get a new surface"
This also adds a video init check, which is related to this issue: #2605
But I don't know if it should stay here, because if, for instance, we implicitly init video on Window creation, this check shouldn't be needed here?