From 3d86951928b09c85a013b2be6c74aec2c7cdf285 2010-08-27 16:05:24
From: epatters <epatters@enthought.com>
Date: 2010-08-27 16:05:24
Subject: [PATCH] Added comment explaining why the behavior of Ctrl-L cannot be improved, after trying and failing to do so.

---

diff --git a/IPython/frontend/qt/console/console_widget.py b/IPython/frontend/qt/console/console_widget.py
index ab24f11..d09bd3d 100644
--- a/IPython/frontend/qt/console/console_widget.py
+++ b/IPython/frontend/qt/console/console_widget.py
@@ -643,6 +643,13 @@ class ConsoleWidget(Configurable, QtGui.QWidget):
                 intercepted = True
 
             elif key == QtCore.Qt.Key_L:
+                # It would be better to simply move the prompt block to the top
+                # of the control viewport. QPlainTextEdit has a private method
+                # to do this (setTopBlock), but it cannot be duplicated here
+                # because it requires access to the QTextControl that underlies
+                # both QPlainTextEdit and QTextEdit. In short, this can only be
+                # achieved by appending newlines after the prompt, which is a
+                # gigantic hack and likely to cause other problems.
                 self.clear()
                 intercepted = True