[Octave-bug-tracker] [bug #43907] OpenGL render code called even when gnuplot is graphics_toolkit

[Dan Sebald]

Follow-up Comment #3, bug #43907 (project octave):

I agree that a graphics toolkit change should close all the existing figure
windows, but it would be nice to then re-plot the figures in the new toolkit. 
Otherwise there will be some users caught be surprise and annoyed that their
work has disappeared.

However, doesn't 'close all' end up discarding the figure contents?  Is it
possible to reconstruct a plot from its property settings?  I think that may
be the case in gnuplot, i.e., some kind of internal "drawnow" function.

It seems to me that every toolkit needs some type of "startup" method and some
type of "shutdown" method that does the following:

startup) search for all existing figure descriptions with property settings,
create associated windows and redraw

shutdown) go through the existing figure list and close the window but do not
destroy the property/memory contents for the figure


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