Common subdirectories: ucblogo-6.0/csls and ucblogo-6.0wx/csls
Common subdirectories: ucblogo-6.0/docs and ucblogo-6.0wx/docs
Common subdirectories: ucblogo-6.0/emacs and ucblogo-6.0wx/emacs
Common subdirectories: ucblogo-6.0/helpfiles and ucblogo-6.0wx/helpfiles
Common subdirectories: ucblogo-6.0/logolib and ucblogo-6.0wx/logolib
diff -u ucblogo-6.0/wxTerminal.cpp ucblogo-6.0wx/wxTerminal.cpp
--- ucblogo-6.0/wxTerminal.cpp	2019-08-30 11:44:20.982827709 -0600
+++ ucblogo-6.0wx/wxTerminal.cpp	2019-08-30 11:40:02.061790995 -0600
@@ -500,13 +500,7 @@
 void LogoFrame::OnSaveAs(wxCommandEvent& WXUNUSED(event)) {
 	wxFileDialog dialog(this,
 			    _T("Save Logo Workspace"),
-			    (firstloadsave ?
-#ifdef __WXMAC__   /* needed for wxWidgets 2.6 */
-			      *wxEmptyString :
-#else
-			      wxStandardPaths::Get().GetDocumentsDir() :
-#endif
-			      *wxEmptyString),
+			    *wxEmptyString,
 			    wxEmptyString,
 			    _T("Logo workspaces(*.lg)|*.lg|All files(*)|*"),
 //			    "*",
@@ -536,13 +530,7 @@
 	(
 	 this,
 	 _T("Load Logo Workspace"),
-	 (firstloadsave ?
-#ifdef __WXMAC__   /* needed for wxWidgets 2.6 */
-	    *wxEmptyString :
-#else
-	    wxStandardPaths::Get().GetDocumentsDir() :
-#endif
-			  *wxEmptyString),
+	 *wxEmptyString,
 	 wxEmptyString,
 	 _T("Logo workspaces(*.lg)|*.lg|All files(*)|*"),
 //	 "*",
@@ -938,7 +926,7 @@
   //dc.GetTextExtent("(", &dummy, ch);
 
   int descent, extlead; 
-  dc.GetTextExtent(wxString("M", wxConvUTF8, wxSTRING_MAXLEN), cw, ch, &descent, &extlead);
+  dc.GetTextExtent(wxString("M", wxConvUTF8, wxString::npos), cw, ch, &descent, &extlead);
   //for the tails of g's and y's, if needed.
 #ifdef __WXMSW__
     *ch += descent + extlead + 1;
diff -u ucblogo-6.0/wxTurtleGraphics.cpp ucblogo-6.0wx/wxTurtleGraphics.cpp
--- ucblogo-6.0/wxTurtleGraphics.cpp	2019-08-30 11:44:20.983827713 -0600
+++ ucblogo-6.0wx/wxTurtleGraphics.cpp	2019-08-30 11:41:21.255108083 -0600
@@ -558,7 +558,7 @@
 extern "C" void wx_get_label_size(int *w, int *h) {
     /* returns size in pixels; converted to turtle steps in wxterm.c */
   int descent, extlead;
-  m_memDC->GetTextExtent(wxString("M", wxConvUTF8, wxSTRING_MAXLEN), w, h, &descent, &extlead);  
+  m_memDC->GetTextExtent(wxString("M", wxConvUTF8, wxString::npos), w, h, &descent, &extlead);  
 }
 
 extern "C" void wx_adjust_label_height() {
@@ -573,7 +573,7 @@
     label_font.SetPointSize(font_size);
 
     m_memDC->SetFont(label_font);	
-    m_memDC->GetTextExtent(wxString("M", wxConvUTF8, wxSTRING_MAXLEN), &cw, &ch, &descent, &extlead);
+    m_memDC->GetTextExtent(wxString("M", wxConvUTF8, wxString::npos), &cw, &ch, &descent, &extlead);
 
     //now... first figure out whether we undershot or overshot...
     //this determines which direction to change the size
@@ -592,7 +592,7 @@
 	    }
 	    if (expected == 100) break;
 	    m_memDC->SetFont(tmp_font);	
-	    m_memDC->GetTextExtent(wxString("M", wxConvUTF8, wxSTRING_MAXLEN), &cw, &tmp_height, &descent, &extlead);
+	    m_memDC->GetTextExtent(wxString("M", wxConvUTF8, wxString::npos), &cw, &tmp_height, &descent, &extlead);
 
 	    if(tmp_height >= px_height) break;
 
@@ -611,7 +611,7 @@
 	    }
 	    if (expected == 2) break;
 	    m_memDC->SetFont(tmp_font);	
-	    m_memDC->GetTextExtent(wxString("M", wxConvUTF8, wxSTRING_MAXLEN), &cw, &tmp_height, &descent, &extlead);
+	    m_memDC->GetTextExtent(wxString("M", wxConvUTF8, wxString::npos), &cw, &tmp_height, &descent, &extlead);
 
 	    if(tmp_height <= px_height) break;
 
diff -u ucblogo-6.0wx/wxTerminal.cpp ucblogo-6.0wx3/wxTerminal.cpp
--- ucblogo-6.0wx/wxTerminal.cpp	2019-08-30 11:40:02.061790995 -0600
+++ ucblogo-6.0wx3/wxTerminal.cpp	2019-08-30 16:40:39.664086823 -0600
@@ -1883,7 +1883,9 @@
     //  return;
     //}
   }
-  dc.Blit( t_x, t_y, w, h, &dc, t_x, t_y, wxINVERT);
+  if (w > 0 && h > 0) {
+    dc.Blit( t_x, t_y, w, h, &dc, t_x, t_y, wxINVERT);
+  }
 }