These are the common shell shortcuts for respectively searching backward
and forward in command history. I use the Python Console plug-in so much
for testing that it started to weigh on me on how ineffective it was not
to be able to search through the history and laboriously hit Up/Down
buttons instead.
While doing a search, most navigation keys would trigger to stop the
search (and stay at the current history item followed by whatever the
key was supposed to do, such as changing cursor position, etc.). Esc in
particular would just stop the search and do nothing else.
Ctrl-C though would reset the search and get the text back to what it
was before search started.
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