added wxHtmlWindow::HistoryCanBack/Forward

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@8516 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/htwindow.tex

@@ -98,6 +98,21 @@ Returns the related frame.
 Moves back to the previous page. (each page displayed using 
 \helpref{LoadPage}{wxhtmlwindowloadpage} is stored in history list.)
 
+\membersection{wxHtmlWindow::HistoryCanBack}\label{wxhtmlwindowhistorycanback}
+
+\func{bool}{HistoryCanBack}{\void}
+
+Returns true if it is possible to go back in the history (i.e. HistoryBack()
+won't fail).
+
+\membersection{wxHtmlWindow::HistoryCanForward}\label{wxhtmlwindowhistorycanforward}
+
+\func{bool}{HistoryCanForward}{\void}
+
+Returns true if it is possible to go forward in the history (i.e. HistoryBack()
+won't fail).
+
+
 \membersection{wxHtmlWindow::HistoryClear}\label{wxhtmlwindowhistoryclear}
 
 \func{void}{HistoryClear}{\void}