Toggle the border of your game window on and off with GameMaker on Windows, macOS, and Ubuntu.
Very special thanks to babyjeans <twitter.com/babyj3ans> for helping me figure this out on Windows.
Recall the good old GM 8.1 days where you could window_set_showborder(!window_get_showborder())?
Note: if you modify the library's source, the copyright notice in the library source code must stay intact.
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