bug#35564: [PATCH v4] Tweak dired warning about "wildcard" characters

[Kévin Le Gouguec]

This series of patches consists in

- the same 2 patches as v3
- Noam's refactoring
- some amendments ("occurrence", order of arguments in tests)
- a proof-of-concept for marking the occurrences with '^'

Here is a list of improvements that I plan on tackling Soonish™

1. refrain from adding markers if the minibuffer is not wide enough,

2. use (:inherit '(warning underline)) instead of warning, so that
    - if the warning face has some underlining, it is used,
    - otherwise the underline face makes sure that we don't rely only on
      colors.


Thank you all for your your reviews and your patience.  Sorry I can't
manage to take more time to work on this.

0001-Preserve-text-properties-in-y-or-n-p-prompts.patch
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0002-Tweak-dired-warning-about-wildcard-characters.patch
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0003-Dedup-dired-aux-isolated-char-searching-Bug-35564.patch
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0004-fixup-Dedup-dired-aux-isolated-char-searching-Bug-35.patch
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0005-Add-markers-below-non-isolated-chars-in-dired-prompt.patch
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