Printing improvements: GetPageInfo() gets called after the DC has

been set and after OnPreparePrinting() has been called so it can
report the number of pages accurately; doesn't try to set
number of pages in print dialog, in common with other Windows apps;
wxHTML easy printing's preview shows number of pages
correctly; preview scrollbars are set correctly; keyboard navigation
improved


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22263 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/html/htmprint.h

@@ -152,6 +152,7 @@ public:
     bool HasPage(int page);
     void GetPageInfo(int *minPage, int *maxPage, int *selPageFrom, int *selPageTo);
     bool OnBeginDocument(int startPage, int endPage);
+    void OnPreparePrinting();
 
     // Adds input filter
     static void AddFilter(wxHtmlFilter *filter);