Add wxCursor::GetHotSpot() and implement it for wxMSW and wxGTK.

Allow retrieving the coordinates of the cursor hot spot, at least for the
ports for which we know how to do it.

Closes #16539.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78134 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/cursor.cpp

@@ -275,6 +275,18 @@ wxCursor::wxCursor(const wxString& filename,
     }
 }
 
+wxPoint wxCursor::GetHotSpot() const
+{
+    if ( !GetGDIImageData() )
+        return wxDefaultPosition;
+
+    AutoIconInfo ii;
+    if ( !ii.GetFrom((HICON)GetGDIImageData()->m_hCursor) )
+        return wxDefaultPosition;
+
+    return wxPoint(ii.xHotspot, ii.yHotspot);
+}
+
 namespace
 {