input/cursor: don't send wl_pointer.motion event on pointer unlock warp

On warping to a cursor hint, update the pointer position we track as
well, so that on the next pointer rebase we don't send an unexpected
synthetic motion event to clients.

Fixes #5405.

sway/input/cursor.c

@@ -1244,6 +1244,10 @@ static void warp_to_constraint_cursor_hint(struct sway_cursor *cursor) {
 		double ly = sy + con->content_y - view->geometry.y;
 
 		wlr_cursor_warp(cursor->cursor, NULL, lx, ly);
+
+		// Warp the pointer as well, so that on the next pointer rebase we don't
+		// send an unexpected synthetic motion event to clients.
+		wlr_seat_pointer_warp(constraint->seat, sx, sy);
 	}
 }