doc: Add a comment that window may be NULL.
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Apparently uiMenuItemOnClicked() may pass `NULL` as the `window` parameter under certain circumstances on darwin. At least that possibility is suggested here: - darwin/window.m:461 - darwin/window.m:142 I added a @todo to the docs as well, as I am unaware of how to trigger such behavior. The code does handle that possibility though, so users need to be aware of the possibility to not trigger any `NULL` pointer derefs.
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Apparently uiMenuItemOnClicked() may pass
NULLas thewindowparameter under certain circumstances on darwin. At least that possibility is suggested here:I added a @todo to the docs as well, as I am unaware of how to trigger such behavior. The code does handle that possibility though, so users need to be aware of the possibility to not trigger any
NULLpointer derefs.