Re: Wrapg text at col. 80 on large-ish files - performance aspects.

Taking the approach that this is just another symptom that cleaning up
all the crud that thas accumulated in my vim environment over the years
is long overdue... I decided to look into this further and found the
culprit: I ended up looking at an ~8-year-old mediawiki.vim (!) file in
my ~/.vim/ftdetect.

The lines that cause the problem:

setlocal foldexpr=getline(v:lnum)=~'^\\(=\\+\\)[^=]\\+\\1\\(\\s*<!--.*-->\\)\\=\\s*$'?\">\".(len(matchstr(getline(v:lnum),'^=\\+'))-1):\"=\"
setlocal fdm=expr

I imagine someone familiar with foldexpr's would see at a glance what's
wrong with the fold expression when the number of lines in the file runs
in the thousands...

A bit odd that this should take effect on markdown *.md files or *.txt
files that have nothing to do with *.mw, *.wiki, or *.mediawiki...

Anyway, after commenting out those two lines I'm no longer able to
recreate the problem... and more importantly stuff that I had initially
suspected has now been proven innocent.

I looked at the current version of the mediawiki stuff on github and it
turns out that the foldexr/foldmethod logic was moved to
ftplugin/mediawiki.vim... When I have time I should probably take a look
at the current version... see if this issue (at least in my context) has
been addressed.

Thanks,

CJ

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