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See Dave Penneys' question. Too much got linkified. Presumably we should produce a minimal example on faktetestsite.
The problem was the letter Č in the link http://en.wikipedia.org/wiki/Stone-Čech_compactification. Here's a pretty minimal example.
In the case of Dave's question, I just changed the Č to a C (which is the canonical name for that Wikipedia page anyway). If there were some URL that really required you to have a Č, I think you'd have to percent encode the character, like this: http://en.wikipedia.org/wiki/Stone-%C4%8Cech_compactification. The computer I'm using right now seems to automatically percent encode when I copy and paste URLs.
If anyone was wondering, this is a well-known problem over at meta.stackoverflow.com, e.g.. It isn't going to be fixed, apparently.
I've implemented this patch on MO and faketestsite, so any links added through the editor's interface (i.e. links not added "manually") should get automatically encoded. Please report any bugs here.
@figueroa: Thanks for the bug report. It was the hyphen in "Sine–Gordon" and also the one in "Kramers–Wannier" ... it's an en-dash rather than a hyphen (or something like that). Compare: –-.
I must have accidentally removed the WMD patch when I implemented the live math preview (so that the input box doesn't crawl). I'll fix it now. Edit: it should auto-encode funny characters again now.
"I should have checked more carefully"
No, I think you did exactly the right thing. The editor (and me, for messing up the fix to the editor) is to blame. You should now be able to copy and paste all you like.
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