Fix a regression from ee405dd. After ee405dd, is_window_rect_full_screen() may compare window
rectangles against the empty rectangles of detached monitors. For example, is_window_rect_full_screen()
can incorrectly return TRUE for a (0, 0, 1, 1) rectangle because 0 <= 0 && 1 >= 0 && 0 <= 0 && 1 >= 0
is true.
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https://gitlab.winehq.org/wine/wine/-/merge_requests/1224
The function `scale_font_metrics()` in `win32u/font.c` was generating a division by zero exception in one of the `comctl32` tests (`status.ok`). This patch just short-circuits the ratio check in the function in case `tm->tmHeight == 0`. This was enough to allow the tests to pass.
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https://gitlab.winehq.org/wine/wine/-/merge_requests/1192