colorbar, again

[Francesco Potorti`]

>Sorry I didn't make it clear in my previous e-mail why this issue 
>exists.. The 3.0.x version of colorbar is a light wrapper around a 
>gnuplot colorbox. The position of the colorbox is calculated manually by 
>Octave, and due to the manner that __go_draw_axes__ uses the axis 
>outerposition to set the position of the plot an empirically derived 
>formula for the colorbar size is used. Therefore something like
>
>imagesc(peaks); colorbar()
>
>will give the right colorbar size. Now pcolor is in fact a surface and 
>so is a 3D plot that just has a 2-D view and the size of the window is 
>different than the 2-D gnuplot windows.
>
>The fix is to get the colorbar size calculated from the window size 
>itself. This is what I've done in a patch for 3.1.51+ that is pending. 
>However, I'm not sure that will even fix the issue for gnuplot as the 
>manner in which it scales 3D plots relative to the size and the margins 
>set by Octave is not clear.

In fact, I have your patch to __go_draw_axes__ applied to 3.0, but
little has changed.  So the current workaround is to use imagesc, am I
right?