> I recompiled vim with a DB_COUNT of 5, and that successfully worked to 
> diff five files.  I suspect that the DB_COUNT limit can be raised 
> without difficulty.  I suspect that with a bit of coding that the 
> DB_COUNT could be made arbitrary (ie. dependent upon how many files are 
> being requested for simultaneous diffing).

Absence of limit makes sense. Both 9 and 4 look like some magic number. 4 was 
questioned by OP, I just added a question for 9.

I do not think though somebody is going to bother with memory (de)allocation 
implied by removing the limit. But before increasing limit to 9, 99 or INT_MAX 
one has to answer why. I do not see much difference between 4 and 9: I never 
actually needed more then 3; and even 3 diffed buffers are a bit confusing. 
Thus I would like to hear a use-case that resulted in request to increase the 
limit.

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