fixed wxHtmlParser::SkipCommentTag() to run the initial test in O(1) instead of O(n) in UTF8 build, makes big difference for large HTML files

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48316 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/htmlpars.cpp

@@ -953,7 +953,7 @@ wxHtmlParser::SkipCommentTag(wxString::const_iterator& start,
     wxString::const_iterator p = start;
 
     // comments begin with "<!--" in HTML 4.0
-    if ( end - p < 3 || *++p != '!' || *++p != '-' || *++p != '-' )
+    if ( p > end - 3 || *++p != '!' || *++p != '-' || *++p != '-' )
     {
         // not a comment at all
         return false;