bug#62015: 29.0.60; Regression in fido-mode and fido-vertical-mode

[João Távora]

Hi,

Here's a regression in fido-mode/fido-vertical-mode that I consider
pretty serious as it negates the whole point of the built-in
flex-matching.

emacs -Q
C-x b foo RET
C-x b afoo RET
C-x b *scratch* RET
M-x fido-mode
C-x b foo

The last step used to show both "foo" and "afoo" buffers until recently,
now it only shows "foo" and says "[Matched]".

I'm on commit a7cd125d490295eb24edf43119f3d3511c3dfddd of emacs-29.

João