* Added support for Ctrl-L per Fernando's request.

* Fixed history storing empty commands.
* Fixed long lines in ipythonqt

IPython/frontend/qt/console/console_widget.py

@@ -629,7 +629,13 b' class ConsoleWidget(QtGui.QWidget):'
                     cursor.removeSelectedText()
                 intercepted = True
 
+            elif key == QtCore.Qt.Key_L:
+                self.clear()
+                intercepted = True
+
             elif key == QtCore.Qt.Key_X:
+                # FIXME: Instead of disabling cut completely, only allow it
+                # when safe.
                 intercepted = True
 
             elif key == QtCore.Qt.Key_Y:
@@ -1285,7 +1291,10 b' class HistoryConsoleWidget(ConsoleWidget):'
             source, hidden, interactive)
 
         if executed and not hidden:
-            self._history.append(history.rstrip())
+            # Save the command unless it was a blank line.
+            history = history.rstrip()
+            if history:
+                self._history.append(history)
             self._history_index = len(self._history)
 
         return executed