https://bugzilla.wikimedia.org/show_bug.cgi?id=21351

--- Comment #4 from Max Semenik <maxsem.w...@gmail.com> 2010-05-08 18:18:15 UTC 
---
A quick note on how AWB's diff system works. It employs a 3-pass system, as
opposed to MediaWiki's 2 steps:
1) Line-level diff
2) Word-level diff
3) Whitespace diff, where whitespace at the end of otherwise matching words is
diffed.
To render highlighted whitespace properly, it's replaced with non-breaking
spaces, thus copy-pasting from diffs can yield unexpected results.

Note that I wrote AWB's diff system based on wikidiff2, not PHP diff so if
they're different...

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