Code review comment for lp://staging/~alan-griffiths/mir/client-initiates-user-move-and-resize

Andreas is right, even if we can change the buffer size, this isn't the same as requesting a resize operation from an input event.

In gtk, we have this api we're expected to implement:

https://git.gnome.org/browse/gtk+/tree/gdk/gdkwindow.c#n8649

So for mir_window_request_user_resize(), I'd expect it to be able to at least accept a directional argument that allows us to do a fixed resize in a certain direction. I believe there should also be special semantics if the client doesn't specify any direction, where the server should decide that based on the initial mouse motion or initial arrow key press.

I wouldn't expect the client to get a mouse up event on completion of the resize, or any events other than resize ones during the client's resizing. So from Gerry's comment, (a) is the most sensible for us in gtk, especially from the api's point of view. If there's non-resizable windows, the server should already know that from the time the window was created, and just reject any resize operation in that case.

It also needs to be implemented so that the user can also resize using the keyboard arrow keys as well.