[client] mouse: correct issues with cursor alignment on enter/exit/focus

client/include/interface/displayserver.h

@@ -92,9 +92,14 @@ struct LG_DisplayServerOps
   void (*grabKeyboard)();
   void (*ungrabKeyboard)();
 
-  //exiting = true if the warp is to leave the window
+  /* exiting = true if the warp is to leave the window */
   void (*warpPointer)(int x, int y, bool exiting);
 
+  /* called when the client needs to realign the pointer. This should simply
+   * call the appropriate app_handleMouse* method for the platform with zero
+   * deltas */
+  void (*realignPointer)();
+
   /* clipboard support */
   bool (* cbInit)(void);
   void (* cbNotice)(LG_ClipboardData type);