omniplex wrote:

Whatever it is, it's not everywhere.

omniplex wrote:

I've tracked it down in http://en.wikipedia.org/wiki/User:Omniplex/5569

Theory: On a page with <pre>...</pre> later occurences of
nbsp or #160 are translate to a space. An empty <pre></pre>
doesn't have this side-effect.

The example was in a discussion about another <pre> oddity
at the bottom of:

http://en.wikipedia.org/wiki/Wikipedia_talk:Qif_conditionals#m:ParserFunctions

Something with <pre> is odd. And that's not new, I always
(this year) avoided it, because it doesn't behave like a
normal XHTML <pre>.

Please provide example input and output, clearly labeled.

omniplex wrote:

Broken after <pre> </pre>:
http://en.wikipedia.org/w/index.php?title=User:Omniplex/5569&oldid=48404599

Okay after <pre></pre>:
http://en.wikipedia.org/w/index.php?title=User:Omniplex/5569&oldid=48404643

JFTR I added an example for the other <pre> oddity,
where it affects text on the same line before <pre>:
http://en.wikipedia.org/w/index.php?title=User:Omniplex/5569&oldid=48558136

Probably a bug in tidy. Can reproduce locally only with tidy enabled.

• Bug 5717 has been marked as a duplicate of this bug. ***

omniplex wrote:

This hits me about once per day, and there's absolutely no workaround,
therefore I mark it as "serious". It's easy to avoid all &lt;pre&gt;
and Wiki "space in column one" on a new page, but a PITA on old pages
if I want &nbsp; to work as designed.

It breaks my signature. It breaks templates like Tlx and Tlsp. It breaks
dummy &nbsp; table cells.

• Bug 6339 has been marked as a duplicate of this bug. ***

• Bug 6430 has been marked as a duplicate of this bug. ***

• Bug 6725 has been marked as a duplicate of this bug. ***

Created attachment 2122
test case to reproduce the problem with tidy on the command line

I can verify the bug (directly on the command line) with the tidy version "HTML
Tidy for Linux/x86 released on 1st March 2004": After the <pre>-block, all
&nbsp; are replaced by regular space. This is fixed in newer versions of tidy:
the problem is gone in version "HTML Tidy for Linux/x86 released on 1 September
2005".

Attached:

ayg wrote:

This breaks <poem> tags too (see [[s:en:Help:Editing poetry]]).

ayg wrote:

This is because Tidy hasn't been updated, not a MediaWiki problem. MediaWiki ->
Wikimedia.

erikbaas wrote:

This bug breaks pages and templates on Dutch WP too: [[s:nl:Gebruiker:Erik
Baas/5569]]

erikbaas wrote:

The problem seems to have disappeared; see
http://nl.wikipedia.org/wiki/Gebruiker:Erik_Baas/5569

ayg wrote:

Should have been fixed by Tim upgrading Tidy.