bug#9591: 24.0.50; buffer name completion

[Richard Stallman]

    The suggestion is that if you type `C-x b SPC foo TAB', you will then
    see all buffers that have names containing the substring "foo", no
    matter whether they have a leading space or not.

That seems like a reasonable thing for substring completion to do
on buffer names.  I think substring completion should not be enabled
for buffer names by default, since it is too wild in its behavior.


-- 
Dr Richard Stallman
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