Fix calculation of the margins for owner-drawn menu items.

Take into account the widths of the bitmaps properly.

Closes #11268.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63222 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/menu.h

@@ -120,6 +120,14 @@ private:
     wxAcceleratorArray m_accels;
 #endif // wxUSE_ACCEL
 
+#if wxUSE_OWNER_DRAWN
+    // true if the menu has any ownerdrawn items
+    bool m_ownerDrawn;
+
+    // the max width of menu items bitmaps
+    int m_maxBitmapWidth;
+#endif // wxUSE_OWNER_DRAWN
+
     DECLARE_DYNAMIC_CLASS_NO_COPY(wxMenu)
 };