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From: Helmut Giese <hgiese@ratiosoft.com>
Newsgroups: comp.lang.tcl
Subject: Img package 1.4.13 broken
Date: Wed, 20 Nov 2024 21:36:34 +0100
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Hello out there,
the Img package distributed with the latest versions of Tcl contain a
bug - well, not really 'Img' itself but rather the zlib DLL it uses.

Here is what happened:
When trying to run the second example from

https://wiki.tcl-lang.org/page/CollapsableFrame+%2DA+Toggle+Resized+Labelled+Frame+Container
I got the error
	IDAT: invalid distance too far back
		while executing
	image create photo iconeClose -format png -data $data
		...
with data being defined as
        set data
"iVBORw0KGgoAAAANSUhEUgAAABAAAAAOCAIAAAHeSjtLAAAABGdBTUEAAYagMei\
WXwAAAKBJREFUCJmlUCESxCAMXJiIPqfyJOJEn8WTIpGRJxEInoKoOAGTo6X05uZ2EGw2ySYxZS8ALIC\
coqmMcooATNlL/QEgAMyhkpbXFM1hDhYdSAs+3db1oaEYX8yBlOCIJpwqzvaK7bnZnOJCS//qcGcP7Wn\
HPl+Ei6nagt77MV1EDne8B3MQEVI+uij6e9FMmDWabjfDHwWX84xx45z7yeENMlJR1s8KWugAAAAASUV\
ORK5CYII="

I found a mention of this error in
	https://mirror.netzwerge.de/openbsd/Changelogs/ChangeLog.62
Search for 'invalid distance' , 2nd occurrence.

There it is said that this error was introduced in zlib 1.2.2.2 and
fixed - I think - by this commit
	CVSROOT:	/cvs
	Module name:	src
	Changes by:	tb@cvs.openbsd.org	2022/03/25 04:58:39

It's long ago that I filed a bug and have forgotten how and where.
If you consider it a bug, too, I would be glad for a note how to
report it.
Helmut