Re: C-r and C-s in minibuffer should search completion

[Stefan Monnier]

>>> However, there is one problem now: `C-x b M-n M-n' puts in the minibuffer
>>> the name of the current buffer because the current buffer is in the front
>>> of the buffer list acquired from the completion table in read-buffer.
>> 
>> This is a very minor problem.

> This is a usability problem for users who will prefer using `C-x b M-n M-n'
> to switch buffers by recency.  And the current buffer will be annoying
> in this list.

Again, a very minor problem.

>>> But it makes no sense to switch to the current buffer, so the case 'B'
>> 
>> Then switch-to-buffer should use a completion predicate that rules out
>> the current-buffer.  And the history functions should pay attention to it.

> The completion list still should contain the current buffer for other
> commands that read a buffer name and whose semantics may require
> the presence of the current buffer in the completion list.

Is that supposed to disagree with what I wrote?

> Since removing the current buffer from the list of defaults is necessary
> only for three commands `C-x b', `C-x 4 b' and `C-x 5 b', I propose just
> to check for their names before removing the current buffer from the list:

No, this is the wrong way to go about it.  The special code should be in
C-x b, C-x 4 b, and C-x 5 b.  Checking the caller inside the minibuffer
is *bad*.  I already suggested a much better solution: use
a minibuffer-completion-predicate.  That's what it's for.


        Stefan