Better fix for wxSpinCtrlGeneric enabling/disabling bug in wxMSW.

To really ensure that the window containing the components of wxSpinCtrlGeneric
is never enabled under MSW (as we want to avoid this to ensure that any input
always goes to its children and not the window itself, see #12045), override
DoEnable() and not Enable(). This takes care of the case when the control gets
implicitly disabled because its parent is.

Closes #13142.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70178 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/spinctlg.h

@@ -108,6 +108,11 @@ protected:
     virtual wxSize DoGetBestSize() const;
     virtual void DoMoveWindow(int x, int y, int width, int height);
 
+#ifdef __WXMSW__
+    // and, for MSW, enabling this window itself
+    virtual void DoEnable(bool enable);
+#endif // __WXMSW__
+
     // generic double valued functions
     double DoGetValue() const { return m_value; }
     bool DoSetValue(double val);