[Octave-bug-tracker] [bug #43664] ginput() freezes upon double-clicking in a fltk figure

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?43664>

                 Summary: ginput() freezes upon double-clicking in a fltk
figure
                 Project: GNU Octave
            Submitted by: None
            Submitted on: ven. 21 nov. 2014 16:04:15 UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: Adrian
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.2
        Operating System: GNU/Linux

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Details:

On my computer the bug can be reliably reproduced by the following few
instructions in a fresh interactive session: 

# display a large image, then invoque ginput:
a=0:2000;
imagesc(a'*a)
ginput(1)

and then double-clicking inside the Figure window. Normally (such as for a
normal plot() window or if I replace 2000 by a small number such as 20 in the
instructions above) the function ginput(1) will return upon the double-click.
In the above example however the function does not return, and appears to have
frozen: it does not return even upon subsequent clicks (simple left or right
click) into the Figure window. The function has to be interrupted by pressing
Ctrl-C.

The expected behaviour would at least be not to freeze, and either return
immediately or on the next click.
Because double-clicking in a fltk Figure window has a special effect (causing
an autoscale), I feel that ginput() should not react at all to it (lest there
be a way to tell the double-click from a simple click, so we know what is a
mere change of the zoom level and what is real input). But that's another
debate, the bug report here is about the freezing.

System details:
GNU/Linux Debian mixed stable/testing
octave is configured to use fltk as graphics_toolkit
(using graphics_toolkit("gnuplot") the bug disappears, that is ginput(1)
returns upon double-click, but here the double-click also does not have the
special effect of causing an autoscale as in the fltk window)





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