Fichiers qui apparaissent modifiés dans Git alors qu’ils ne le sont pas

Symptôme :

germain@germain-xps MINGW64 ~/Documents/Sites/site.preprod (master)
$ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   www/markup-anim/article.html
        modified:   www/markup-anim/board.html
        modified:   www/markup-anim/contact.html
        modified:   www/markup-anim/css/style.css
        modified:   www/markup-anim/inc/hub-markers.json
        modified:   www/markup-anim/inc/hub-popup-structure.html
        modified:   www/markup-anim/inc/hub-section-01.html
        modified:   www/markup-anim/inc/hub-section-02.html
        modified:   www/markup-anim/inc/hub-section-03.html
        modified:   www/markup-anim/inc/hub-section-04.html
        modified:   www/markup-anim/inc/hub-section-05.html
        modified:   www/markup-anim/inc/index-markers.json
        modified:   www/markup-anim/inc/popup-section-01.html
        modified:   www/markup-anim/index.html
        modified:   www/markup-anim/js/app.js
        modified:   www/markup-anim/knowledge-network.html
        modified:   www/markup-anim/news.html
        modified:   www/markup-anim/pdf-templates.html
        modified:   www/markup-anim/regional-hubs.html

Il semble donc que tous les fichiers de la liste soient modifiés.
Pourtant, quand on cherche les différences, point de modification :

germain@germain-xps MINGW64 ~/Documents/Sites/site.preprod (master)
$ git diff www/markup-anim/article.html

On peut déjà commencer par vérifier qu’on ignore les différences de sauts de lignes, et de permissions sur les fichiers :

germain@germain-xps MINGW64 ~/Documents/Sites/site.preprod (master)
$ git config --global core.autocrlf true
$ git config --global core.fileMode false

Si ça ne résout pas le problème instantanément, il est nécessaire de rafraîchir l’index :

git add --renormalize .

À quoi ça sert ?

       --renormalize
           Apply the "clean" process freshly to all tracked files to
           forcibly add them again to the index. This is useful after
           changing core.autocrlf configuration or the text attribute in
           order to correct files added with wrong CRLF/LF line endings.
           This option implies -u.

À l’issue :

germain@germain-xps MINGW64 ~/Documents/Sites/site.preprod (master)
$ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
        modified:   www/markup-anim/css/style.css
        modified:   www/markup-anim/inc/hub-markers.json
        modified:   www/markup-anim/inc/hub-section-01.html
        modified:   www/markup-anim/inc/hub-section-02.html
        modified:   www/markup-anim/inc/hub-section-03.html
        modified:   www/markup-anim/inc/hub-section-04.html
        modified:   www/markup-anim/inc/hub-section-05.html
        modified:   www/markup-anim/js/app.js
        modified:   www/markup-anim/regional-hubs.html

Seuls les fichiers réellement modifiés apparaissent maintenant à l’index.