Sidebar sorting does not account for `short-title` in front matter

[dipikabh]

What information was incorrect, unhelpful, or incomplete?

When using type: listSubPages in the sidebar YAML, items in the sidebar are sorted in the alphabetical order of their titles. This is the default behavior.

However, this sorting does not consider short-title for sorting even though short-title is what's actually displayed in the sidebar. The sorting still uses title even if short-title is present.

Check out this demo commit that uses type: listSubPages: dipikabh/content@dea9711. This produces the following sorting in the sidebar:

For context, these pages have the following titles and short-titles in their front matters:

title	short-title	slug
HTML cheatsheet for syntax and common tasks	HTML cheatsheet	Web/HTML/Guides/Cheatsheet
Using HTML comments	Comments	Web/HTML/Guides/Comments
Using HTML form validation and the Constraint Validation API	Constraint validation	Web/HTML/Guides/Constraint_validation
Content categories	-	Web/HTML/Guides/Content_categories
Using date and time formats in HTML	Date and time formats	Web/HTML/Guides/Date_and_time_formats
Using microdata in HTML	Microdata	Web/HTML/Guides/Microdata
Using microformats in HTML	Microformats	Web/HTML/Guides/Microformats
Understanding quirks and standards modes	Quirks and standards modes	Web/HTML/Guides/Quirks_mode_and_standards_mode
Using responsive images in HTML	Responsive images	Web/HTML/Guides/Responsive_images
Using the viewport meta element	Viewport meta element	Web/HTML/Guides/Viewport_meta_element

What did you expect to see?

• Expected to see the following ordering in the sidebar when using listSubPages:

Comments
Constraint validation
Content categories
Date and time formats
HTML cheatsheet
Microdata
Microformats
Quirks and standards modes
Responsive images
Viewport meta element

• If a page defines a short-title, that should be used for sorting along with other pages that have only title defined, so that alphabetical ordering happens regardless of which field is present in the front matter.

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

The problem I'm reporting here is not on the site, I observed this when I earlier used type: listSubPages.

The list under "Guides" section in the HTML sidebar has now been manually ordered (in this PR) to list more familiar tasks first and niche or advanced topics later.