Path: utzoo!attcan!uunet!lll-winken!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!TUB.BITNET!net
From: net@TUB.BITNET (Oliver Laumann)
Newsgroups: comp.windows.x
Subject: Bugs in list widget
Message-ID: <8902211520.AA06900@tub.UUCP>
Date: 21 Feb 89 15:20:40 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 23

During the last days I had the pleasure to ``fight'' with the
Athena ``list'' widget.  I disvovered two bugs (and there are
probably more; I didn't test everything):

1)  When the widget instance is initialized, the ``list'' resource
    is referenced (in an attempt to count the items) and *then*
    initialized to a default value.  As a consequence, application
    programmers *must* pass a value for XtNlist to the call of
    XtCreateWidget().  Otherwise a NULL pointer is referenced
    in the function ResetList().

    This can be fixed by moving the initialization of the ``list''
    resource in front of the call to ResetList().

2)  The function PaintItemName() is sometimes called with an
    out-of-range item number which causes a segmentation
    violation or a bus error.  I don't know under which
    circumstances this happens or how it can be fixed.
    It looks like an off-by-one error.

Regards,
--
Oliver Laumann              net@TUB.BITNET              net@tub.UUCP