Line continuation marker (>) missing from GUI console

[Daniel J Sebald]

I've tried the latest development code.  It compiles as usual, so I see 
no C++11 issues.

I did just notice though that the line continuation marker doesn't 
appear in the GUI.  For example, when running with --no-gui, I see

octave:1> plot(1:50
> )
octave:2> exit

but with the GUI I see

> > plot(1:50
)
> >

The point is that with a fairly complex expression in the GUI it can 
appear that Octave suspends rather than there being a syntax error in 
the entered string.

It's strange because I thought that the console in the GUI was a 
straightforward redirection of output from the core.

Is this a bug?

Dan