the window on which to set the modal state.
true to toggle modal status on, false to toggle it off.
true on success or false on failure; call SDL_GetError() for more information.
Threadsafety: This function should only be called on the main thread.
SDL_SetWindowParent SDL_WINDOW_MODAL
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Toggle the state of the window as modal.
To enable modal status on a window, the window must currently be the child window of a parent, or toggling modal status on will fail.