the window of which to change the border state.
false to remove border, true to add border.
true on success or false on failure; call SDL_GetError() for more information.
Threadsafety: This function should only be called on the main thread.
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Set the border state of a window.
This will add or remove the window's SDL_WINDOW_BORDERLESS flag and add or remove the border from the actual window. This is a no-op if the window's border already matches the requested state.
You can't change the border state of a fullscreen window.