bug#38992: 27.0.60; when enabled, fido-mode seems to break vc-git-grep

[Dmitry Gutov]

On 23.01.2020 19:28, Stefan Monnier wrote:
> We could introduce a new `minibuffer-require-match` variable (and mark
> `minibuffer-completion-confirm` obsolete).

Why don't we just co-opt the older variable. A rename can come later. 
See patch 1.

Here's another issue related to the previous proposed fix: why *would* 
M-j exit minibuffer in all cases? It currently doesn't honor 
REQUIRE-MATCH=t (or the confirm- values, but I don't care about that). 
The default completing-read, as well as icomplete-mode, both honor it. 
The patch 2 fixes that.

Please take a look, y'all.

0001-Honor-require-match-nil-in-icomplete-fido-ret.patch
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0002-Make-M-j-in-fido-mode-honor-REQUIRE-MATCH-t.patch
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