On 9/13/2011 3:52 PM, Juri Linkov wrote:
>> Any other arguments wrt the default value?
> 
> Another argument for not exiting isearch with C-u by default
> is that some isearch commands accept the C-u argument and change
> their behavior accordingly depending on `current-prefix-arg' like
> `isearch-yank-char', `isearch-del-char', `isearch-query-replace',
> `isearch-query-replace-regexp', `isearch-occur', but currently users
> can't use C-u to access their full functionality without customizing
> `isearch-allow-scroll' to t.
> 

Also, there are plenty of ways to exit isearch other than C-u. I can't
remember ever using C-u to exit isearch, in fact, and if the prefix
argument is still applied to any command that _does_ exit isearch, I see
no problem changing the default behavior.