the window for which to set the text input area.
the SDL_Rect representing the text input area, in window coordinates, or NULL to clear it.
the offset of the current cursor location relative to rect->x, in window coordinates.
true on success or false on failure; call SDL_GetError() for more information.
Threadsafety: This function should only be called on the main thread.
Set the area used to type Unicode text input.
Native input methods may place a window with word suggestions near the cursor, without covering the text being entered.