colorbar problem with fltk backend

[John W. Eaton]

With the gnuplot backend, if I do

  sombrero ();
  colorbar ();

and then maximize the figure window, the colorbar remains properly
scaled and positioned within the figure window.

With the fltk backend, the axes for the colorbar (there is no colorbar
image because images are not yet supported) are not scaled or moved
relative to the plot window when it is maximized, so they end up
at the left side and behind the axes for the sombrero plot.

If I maximize the window then issue the commands above, it seems to
work properly.

jwe