How do I clear the screen in Sage/Qtconsole?
The problem:
$ sage -ipython qtconsole
(... Qtconsole opens ...)
In [1]: clear
[...] UnboundLocalError: local variable 'f' referenced before assignment
In [2]: %clear
[...] UnboundLocalError: local variable 'f' referenced before assignment
In [3]: clear-screen
[...] UnboundLocalError: local variable 'f' referenced before assignment
In [4]: cls
[...] NameError: name 'cls' is not defined
Note that the first three commands clear the screen in regular Qtconsole (ipython qtconsole).
Is this a bug? Is there no way to clear the screen in Sage running inside Qtconsole?
(Sage Version: 5.12, IPython Version: 0.13.2)
