Override InheritAttributes() to do nothing in wxNonOwnedWindow.

Non owner windows shouldn't inherit attributes from their parent. This wasn't
a problem in wxMSW where InheritAttributes() was never called for them but was
in wxGTK (and possibly other ports) where dialogs inherited font from their
parent.

Closes #2766.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70813 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/nonownedwnd.h

@@ -69,6 +69,13 @@ public:
         // client area origin so simply do nothing here.
     }
 
+    virtual void InheritAttributes()
+    {
+        // Non owned windows don't inherit attributes from their parent window
+        // (if the parent frame is red, it doesn't mean that all dialogs shown
+        // by it should be red as well), so don't do anything here neither.
+    }
+
 protected:
     virtual bool DoClearShape()
     {