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Olivier Fourdan authored
The XDG portal RemoteDesktop API supports both relative and absolute pointer motion events. However, for the latter, it requires a Screencast session to be initiated first, and the Screencast session is limited to a single output by default, meaning that we cannot use that API for the entire X11 screen which may include more than one output. So the Screencast session is not practical to use in the Xwayland case, therefore we limit who relative motion events. If the pointer is placed on an Xwayland window, we can deduce the relative motion since the global location is known to Xwayland on X11 surfaces, in which case we shall honor the request. However, if the pointer has left all X11 surfaces, there is no way for Xwayland to know the actual location of the pointer in the global compositor space and hence deduce the relative motion, so in this case we simply ignore the request for now. Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
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