Diffing commits of big files is slow

[Aaron Bentley]

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Martin Pool wrote:
> 2009/6/22 Robert Collins <robert.collins at canonical.com>:
>> On Mon, 2009-06-22 at 01:51 +0200, Daniel Clemente wrote:
>>> In a pack-0.92 branch with latest Bazaar (1.17dev), I replaced a 40 Mb video with a newer version (30Mb).
>>>
>>>   I am intrigued as to why the following operations are so slow:
>> bzr doesn't know that the files are binary until it extracts them and
>> examines the content. It knows they are different before extracting, but
>> that doesn't help a lot.
> 
> I guess it could shortcut this case by streaming the file out and
> looking at just the start of it.

I could have sworn we did that already.  We certainly have the code, in
textfile.text_file.

Aaron
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