HelpText.cpp has fewer dependencies...

... freeing it to a low level and AboutDialog.cpp to a high level, by moving
functions from the latter into the former

src/HelpText.cpp

@@ -21,7 +21,7 @@
 #include <wx/intl.h>
 
 #include "FileNames.h"
-#include "AboutDialog.h"
+#include "Internat.h"
 #include "AllThemeResources.h"
 
 
@@ -328,3 +328,35 @@ wxString FormatHtmlText( const wxString & Text ){
       WrapText( LinkExpand( Text ))+
       wxT("</html>");
 }
+
+// Function to give the extra arguments to put on the version check string.
+const wxString VerCheckArgs(){
+   wxString result = wxString("from_ver=") + AUDACITY_VERSION_STRING;
+#ifdef REV_LONG
+   result += wxString("&CommitId=")+wxString(REV_LONG).Left(6);
+#endif
+   result += wxString("&Time=") + wxString( __DATE__ ) + wxString( __TIME__ );
+   result.Replace(" ","");
+   return result;
+}
+
+// Text of hyperlink to check versions.
+const wxString VerCheckHtml(){
+
+   wxString result = "<center>[[";
+   result += VerCheckUrl() + "|" + _("Check Online");
+   result += "]]</center>\n";
+   return result;
+}
+
+// Url with Version check args attached.
+const wxString VerCheckUrl(){
+   //The version we intend to use for live Audacity.
+#define VER_CHECK_URL "https://www.audacityteam.org/download/?"
+//For testing of our scriptlet.
+//#define VER_CHECK_URL "http://www.audacityteam.org/slug/?"
+//For testing locally
+//#define VER_CHECK_URL "http://localhost:63342/WorkingDocs/demos/download.html?"
+
+   return wxString( wxT(VER_CHECK_URL)) +VerCheckArgs();
+}