[Octave-bug-tracker] [bug #59370] Plotting produces wrong output or takes long time, depending on graphics toolkit

[T Knauss]

Follow-up Comment #8, bug #59370 (project octave):

[comment #7 comment #7:]
> ...
> Using the commands you showed so far, I was not able to reproduce the high
CPU usage and long delay you describe.
> Could you please provide the exact steps that trigger the slowness for you?
> 

That's really easy for me:
1) start Octave GUI
2) graphics_toolkit ("gnuplot")
3) S=[0.966087204808546, 0.966087204808546, 0.966087204808546,
0.966087217807083, 0.966087217807083]
4) plot (S)
5) close the just opened figure by clicking on the red x in the top right
corner of that window (this means, close that window manually using the
mouse)
6) plot (S)
I get a 10 seconds 12.5% CPU usage (100% on one CPU core).
7) close again, like in 5)
8) plot (S), like in 6)
Again 12.5% CPU usage, this time for 23 seconds.
9) close again, like in 5)
10) plot (S), like in 6)
This time, the window was shown instantly.

The next delays were 23s, 0s, 0s, 23s, 23s.
And, curiously, the figure window that was shown after a delay became bigger
and bigger each time, until it reached fullscreen after the 4th delayed
opening. The other windows, which were opened after no delay, were opened in
normal size.
>From the 5th high-CPU call on, no window was shown anymore.

When finally calling "close all", I could restart the whole behaviour, but
partly with different delays.
After restarting Octave GUI, I could restart the behvaiour with the SAME
delays.

Also, I want to add that some figures where shown without any content in the
graph area. Only window with toolbar and status bar was shown, the graph
appeared when clicking on the zoom+.


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