Add release notes for #8874 and rework existing WHCM release notes

CHANGELOG.txt

@@ -105,6 +105,7 @@ Changelog
  * Fix: Make progress bars’ progress visible in forced colors mode (Anuja Verma)
  * Fix: Make checkboxes visible in forced colors mode (Anuja Verma)
  * Fix: Display the correct color for icons in forced colors mode (Anuja Verma)
+ * Fix: Add a border around modal dialogs so they can be identified in forced colors mode (Anuja Verma)
  * Fix: Remove outdated reference to 30-character limit on usernames in help text (minusf)
  * Fix: Resolve multiple form submissions index listing page layout issues including title not being visible on mobile and interaction with large tables (Paarth Agarwal)
  * Fix: Ensure ModelAdmin single selection lists show correctly with Django 4.0 form template changes (Coen van der Kamp)

docs/releases/4.0.md

@@ -40,6 +40,17 @@ Wagtail’s page preview is now available in a side panel within the page editor
 
 In Wagtail 2.12, we introduced theming support for Wagtail’s primary brand colour. This has now been extended to almost all of Wagtail’s colour palette. View our [](custom_user_interface_colours) documentation for more information, an overview of Wagtail’s customisable colour palette, and a live demo of the supported customisations. This was implemented by Thibaud Colas, under the page editor redesign project sponsored by Google.
 
+### Windows High Contrast mode support improvements
+
+In Wagtail 2.16, we introduced support for Windows High Contrast mode (WHCM). This release sees a lot of improvements to our support, thanks to our new contributor Anuja Verma, who has been working on this as part of the [Contrast Themes](https://github.com/wagtail/wagtail/discussions/8193) Google Summer of Code project, with support from Jane Hughes, Scott Cranfill, and Thibaud Colas.
+
+* Improve help block styles with less reliance on communication via colour alone in forced colors mode
+* Add a bottom border to top messages so they stand out from the header in forced colors mode
+* Make progress bars’ progress visible in forced colors mode
+* Make checkboxes visible in forced colors mode
+* Display the correct color for icons in forced colors mode
+* Add a border around modal dialogs so they can be identified in forced colors mode
+
 ### Other features
 
  * Add clarity to confirmation when being asked to convert an external link to an internal one (Thijs Kramer)
@@ -99,8 +110,6 @@ In Wagtail 2.12, we introduced theming support for Wagtail’s primary brand col
  * Add `menu_item_name` to modify MenuItem's name for ModelAdmin (Alexander Rogovskyy, Vu Pham)
  * Add an extra confirmation prompt when deleting pages with a large number of child pages (Jaspreet Singh)
  * Adopt the slim header in page listing views, with buttons moved under the "Actions" dropdown (Paarth Agarwal)
- * Improve help block styles in Windows High Contrast Mode with less reliance on communication via colour alone (Anuja Verma)
- * Add a bottom border to top messages so they stand out from the header (Anuja Verma)
  * Replace latin abbreviations (i.e. / e.g.) with common English phrases so that documentation is easier to understand (Dominik Lech)
  * Add shortcut for accessing StreamField blocks by block name with new [`blocks_by_name` and `first_block_by_name` methods on `StreamValue`](streamfield_retrieving_blocks_by_name) (Tidiane Dia, Matt Westcott)
  * Add HTML-aware max_length validation on RichTextField and RichTextBlock (Matt Westcott)
@@ -130,9 +139,6 @@ In Wagtail 2.12, we introduced theming support for Wagtail’s primary brand col
  * `ngettext` in Wagtail's internal JavaScript internationalisation utilities now works (LB (Ben) Johnston)
  * Ensure the linting/formatting npm scripts work on Windows (Anuja Verma)
  * Fix display of dates in exported xlsx files on macOS Preview and Numbers (Jaap Roes)
- * Make progress bars’ progress visible in forced colors mode (Anuja Verma)
- * Make checkboxes visible in forced colors mode (Anuja Verma)
- * Display the correct color for icons in forced colors mode (Anuja Verma)
  * Remove outdated reference to 30-character limit on usernames in help text (minusf)
  * Resolve multiple form submissions index listing page layout issues including title not being visible on mobile and interaction with large tables (Paarth Agarwal)
  * Ensure ModelAdmin single selection lists show correctly with Django 4.0 form template changes (Coen van der Kamp)