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bug#34077: 27.0.50; icomplete, substring completion and C-x C-f misbehav

From: João Távora
Subject: bug#34077: 27.0.50; icomplete, substring completion and C-x C-f misbehaving
Date: Tue, 15 Jan 2019 17:03:20 +0000

On Mon, Jan 14, 2019 at 4:43 PM João Távora <address@hidden> wrote:
> Hi maintainers,
> I'm using substring completion, icomplete-mode and C-x C-f.  Navigating
> deeper in directories using successive C-M-i's sometimes fails:
>   Emacs -Q
>   M-: (add-to-list 'completion-styles 'substring)
>   M-x icomplete-mode
>   C-x C-f p a t h / t o / e m a c s /
>   s r c C-M-i
> Expected to see the same as if I had typed "s r c /", instead I see
> "{lib-src | src }".

Discovered that this is by design in normal non-icomplete.el
conditions, i.e. minibuffer-force-completion is supposed to cycle.

However in icomplete-mode it doesn't make sense because
its "prospects list" will show what appears to be subfiles of the
completed directory.  Crucially, sometimes they *will* be subfiles
of the completed directory (and that depends on whether the user's
pattern matched one or more before the forced completion, which
cannot be known anymore).

Attach a patch that fixes this for icomplete.el only.

João Távora

Attachment: 0001-Repeated-C-M-i-doesn-t-cycle-directories-in-icomplet.patch
Description: Binary data

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