[RFC/MERGE] Avoid syncing on incorrect lines during diff

[Alexander Belchenko]

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John Arbash Meinel пишет:
> The attached patch changes the PatienceSequenceMatcher algorithm
> slightly, so that it checks for unique lines ignoring whitespace. It
> still matches exact texts, but if two lines only differ by whitespace,
> it does not consider them synchronization points.
> 
> In my (admittedly small) amount of testing, this again improves the
> human-readable quality of the generated diffs.

Yesterday my co-worker ask me what option of diff command could produce
output that ignore whitespace changes. I say -- there is no such option.

Today John write a patch. Amazing.

I wonder if special flag of diff command should be used to force
this behaviour?

Alexander
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