[Octave-bug-tracker] [bug #52694] call to plot or figure fail with infinite call loop between ishandle and ishghandle

[Marshall]

URL:
  <http://savannah.gnu.org/bugs/?52694>

                 Summary: call to plot or figure fail with infinite call loop
between ishandle and ishghandle
                 Project: GNU Octave
            Submitted by: marsian
            Submitted on: Tue 19 Dec 2017 04:53:23 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: Marsian
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Microsoft Windows

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Details:

I finally built a dev version with the features from recent bug fixes I
wanted, but this time, there are also some serious errors introduced probably
related to some recent commits. I find that calls to plot and figure fail (and
maybe others). Calling figure, or plot(rand(10)) both fail and result in
flooding the command prompt with the following:


figure
 ...
    ishandle at line 41 column 10
    ishghandle at line 41 column 10
    ishandle at line 41 column 10
    ishghandle at line 41 column 10
    ishandle at line 41 column 10
    ishghandle at line 41 column 10
    ishandle at line 41 column 10
    ishghandle at line 41 column 10
    ishandle at line 41 column 10
    ishghandle at line 41 column 10
    ishandle at line 41 column 10
    ishghandle at line 41 column 10
    isfigure at line 37 column 9
    graphics_toolkit at line 63 column 5
    figure at line 86 column 7
plot(rand(10))  
 ...
    ishghandle at line 41 column 10
    ishandle at line 41 column 10
    ishghandle at line 41 column 10
    ishandle at line 41 column 10
    ishghandle at line 41 column 10
    isfigure at line 37 column 9
    graphics_toolkit at line 63 column 5
    figure at line 86 column 7
    newplot at line 117 column 10
    plot at line 222 column 9


I can't actually see what the errors are because I can't scroll up due to bug
#52496, but It is clear there is an infinite loop as ishghandle and ishandle
call each other. I'll also note that when first opening matlab I get the
following warning: 


warning: function
C:\Octave\OCTAVE~1.0_\share\octave\4.3.0+\m\plot\util\ishghandle.m shadows a
built-in function





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