[comp.soft-sys.andrew] zip arrowhead bug on rs_aix31

gunsch+@rchland.ibm.com (Paul Gunsch) (12/11/90)

There is a bug in zip when running on rs_aix31 (AKT 15.1, patch level 7)
that manifests itself as incorrectly drawn arrowheads.  The "sides" of
the arrowheads are drawn to some fixed point outside of the window (to
the upper left, to be specific.)  If the file is saved, and then viewed
on some other system (such as RT/AOS 4.3) the arrowheads are drawn
correctly, so the problem appears to be isolated to the display code.

--Paul Gunsch    gunsch@ibm.com

tpn+@ANDREW.CMU.EDU (Tom Neuendorffer) (12/11/90)

Excerpts from mail: 10-Dec-90 zip arrowhead bug on rs_aix31 Paul
Gunsch@rchland.ibm. (457)


> There is a bug in zip when running on rs_aix31 (AKT 15.1, patch level 7)
> that manifests itself as incorrectly drawn arrowheads.  The "sides" of
> the arrowheads are drawn to some fixed point outside of the window (to
> the upper left, to be specific.)  If the file is saved, and then viewed
> on some other system (such as RT/AOS 4.3) the arrowheads are drawn
> correctly, so the problem appears to be isolated to the display code.

Since the drawing code is identical for both machines, I feel confident
in stating that this is a bug in the X server that was supplied with 
rs_aix31. ATK has proven to be a good test suite for X servers, in that
we seem to use parts of X that no-one else has. As a result, many server
bugs show up in ATK and are often mis-attributed to ATK. Unfortunately,
there is not a whole lot we can do about them, outside of reporting them
to those responsible for the X-server in question. Sometimes we can come
up with work arounds, but trying to compensate for the failings of every
X server in the world would be fighting a losing battle. 

	Tom N.