elm_win: Improve wayland cursor change race

When changing cursors under wayland sometimes we'll see the old cursor
moved to the new hotspot briefly before the cursor changes.  This makes
that suck less often.

A proper fix would involve creating a new wayland surface for every
cursor change (actual change, not just a new frame of an animated
cursor).  Given the current internals this is invasive.  Do the
easy thing for now.

src/lib/elementary/efl_ui_win.c

@@ -3196,6 +3196,18 @@ _elm_win_wl_cursor_set(Evas_Object *obj, const char *cursor)
         Ecore_Wl2_Input *input;
         Eina_Iterator *it;
 
+        /* FIXME: Here be dragons...
+           pointer_set_cursor is totally unsynchronized, and on a cursor
+           change we get here before the new cursor is rendered.  So
+           the cursor frequently moves to its new hotspot with the old
+           cursor image, causing an ugly jump.
+           Forcing manual render causes us to render first then set the
+           cursor, which is still racey but far more likely to win the
+           race.
+           The right way to do this is to create an entirely new surface
+           on every cursor change.
+         */
+        ecore_evas_manual_render(sd->pointer.ee);
         it = ecore_wl2_display_inputs_get(ecore_wl2_window_display_get(sd->wl.win));
         EINA_ITERATOR_FOREACH(it, input)
           ecore_wl2_input_pointer_set(input, sd->pointer.surf, sd->pointer.hot_x, sd->pointer.hot_y);