[Octave-bug-tracker] [bug #47699] FLTK can segfault after using legend

[Rik]

Follow-up Comment #23, bug #47699 (project octave):

@Lachlan: I've tried all three csets.  I guess I like the last as the most
minimal.  However, there is still a corner case problem.  If I set a
breakpoint in the callback deletelegend2 and then step through the program I
get same error about invalid graphics object that was originally reported.  I
assume that this is because returning to the debug prompt is like returning to
the Octave prompt and an implicit call to update events and redraw plots is
made each time.

Steps to Reproduce:


plot (1:10)
h = legend ("abc");
dbstop legend>deletelegend2
delete (h)
...
dbnext
...



Maybe this is too much of a corner case to be concerned with, or should we
isolate the offending code with a try/catch block?  I tried that with the
attached diff.  It works, but produces an error message which isn't great.


(file #37015)
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Additional Item Attachment:

File name: 47699_trycatch.cset            Size:1 KB


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