Move an old change into a new client. Old client got messed up.

tools/ddbg/lib/commando.dart

Index: tools/ddbg/lib/commando.dart
===================================================================
--- tools/ddbg/lib/commando.dart	(revision 30862)
+++ tools/ddbg/lib/commando.dart	(working copy)
@@ -263,6 +263,8 @@
 
   void _clearScreen() {
     _stdout.write(_term.clear);
+    _term.resize();
+    _screenWidth = _term.cols - 1;
     _writePromptAndLine();
   }
 
@@ -372,7 +374,6 @@
     
     _currentLine = [];
     _cursorPos = 0;
-    _linePos = _lines.length;
     if (_promptShown) {
       _writePrompt();
     }
@@ -593,7 +594,6 @@
         
   int _nextMargin(int pos) {
     var truePos = pos + prompt.length;
-    var curLine = _getLine(pos);
     return ((truePos ~/ _screenWidth) + 1) * _screenWidth - prompt.length;
   }