With this change, unhandled notifications are all forwarded to hwndNotify and I worry that it might not be the case.
Yes, windows does have more handled notifications.
There are notifications that don't get forwarded.
There are notifications that `nmhdr->code` overwritten and get forwarded.
Not all notifications have `nmhdr->code` that is equal to a macro in mingw-w64's [commctrl.h](https://github.com/mingw-w64/mingw-w64/blob/e3a3dc588a6358bda826934d3adfeaa3...) and [prsht.h](https://github.com/mingw-w64/mingw-w64/blob/e3a3dc588a6358bda826934d3adfeaa3...).
See https://bugs.winehq.org/attachment.cgi?id=77351&action=edit and https://bugs.winehq.org/attachment.cgi?id=77352&action=edit.