LibWeb: Expose MouseEvent.{screenX,screenY}

These are currently the same as clientX and clientY, but it works for
now.

Author: Lubrsi

Userland/Libraries/LibWeb/UIEvents/MouseEvent.h

@@ -37,6 +37,10 @@ class MouseEvent : public UIEvent {
     double client_x() const { return m_client_x; }
     double client_y() const { return m_client_y; }
 
+    // FIXME: Make these actually different from clientX and clientY.
+    double screen_x() const { return m_client_x; }
+    double screen_y() const { return m_client_y; }
+
     double x() const { return client_x(); }
     double y() const { return client_y(); }
 

Userland/Libraries/LibWeb/UIEvents/MouseEvent.idl

@@ -6,6 +6,8 @@ interface MouseEvent : UIEvent {
     readonly attribute double offsetY;
     readonly attribute double clientX;
     readonly attribute double clientY;
+    readonly attribute double screenX;
+    readonly attribute double screenY;
     readonly attribute double x;
     readonly attribute double y;
 
@@ -23,4 +25,4 @@ dictionary MouseEventInit : EventModifierInit {
 
     short button = 0;
 
-};
+};