Update legacy change pages for Dart 3.11 (#7174)

Updates the old breaking change and language evolution pages, as while
they are deprecated and set for removal in the future, developers might
still stumble across them. So for now, let's keep them up to date.

Also updates the what's new on the docs page with some minor clean up
and the addition of a blog post.

Author: parlough

src/content/resources/breaking-changes.md

@@ -3,7 +3,7 @@ title: Breaking changes and deprecations
 breadcrumb: Legacy
 description: A list of breaking changes by release in Dart.
 maxTocDepth: 2
-lastVerified: 2025-08-13
+lastVerified: 2026-02-16
 ---
 
 {% assign versioned = '<span class="tag-label language-versioned-tag">Language versioned</span>' %}
@@ -87,21 +87,32 @@ don't include the section header.
 
 ## 3.11.0
 
-:::note Tentative
-The following changes are expected to be included in the 3.11 stable release,
-but the final list might change before then.
-To reduce the potential impact of these changes, consider
-accounting for them before the 3.11 release.
-:::
-
 ### Tools
 
+#### Analyzer
+
+- {{deprecated}}
+  The [`avoid_null_checks_in_equality_operators`][] lint rule
+  is deprecated and should be removed from `analysis_options.yaml` files.
+
+- {{deprecated}}
+  The [`prefer_final_parameters`][] lint rule
+  is deprecated and should be removed from `analysis_options.yaml` files.
+
+- {{deprecated}}
+  The [`use_if_null_to_convert_nulls_to_bools`][] lint rule
+  is deprecated and should be removed from `analysis_options.yaml` files.
+
+[`avoid_null_checks_in_equality_operators`]: /tools/linter-rules/avoid_null_checks_in_equality_operators
+[`prefer_final_parameters`]: /tools/linter-rules/prefer_final_parameters
+[`use_if_null_to_convert_nulls_to_bools`]: /tools/linter-rules/use_if_null_to_convert_nulls_to_bools
+
 #### Wasm compilation (`dart compile wasm`)
 
 - {{removed}}
   Code that imports `dart:js_util` or `package:js` now
   [results in a compilation error][61550] when compiling to WebAssembly.
-  
+
   Invoking any API from these libraries will result in a runtime error.
   Usages should be migrated to `dart:js_interop` and `dart:js_interop_unsafe`.
 

src/content/resources/language/evolution.md

@@ -3,7 +3,7 @@ title: Dart language evolution
 shortTitle: Language evolution
 breadcrumb: Legacy
 description: Notable changes and additions to the Dart programming language.
-lastVerified: 2024-08-04
+lastVerified: 2026-02-16
 ---
 
 :::warning
@@ -50,6 +50,17 @@ on the Dart language GitHub repo.
 
 ## Changes in each release
 
+### Dart 3.11
+_Released 9 February 2026_
+| [Dart 3.11 announcement](https://blog.dart.dev/announcing-dart-3-11-b6529be4203a)
+
+While Dart 3.11 introduces no new language features,
+the release includes several improvements to
+analyzer and editor support for the
+[dot shorthand][] syntax introduced in Dart 3.10.
+
+[dot shorthand]: /language/dot-shorthands
+
 ### Dart 3.10
 _Released 12 November 2025_
 | [Dart 3.10 announcement](https://blog.dart.dev/ea8b952b6088)

src/content/resources/whats-new.md

@@ -8,7 +8,7 @@ This page describes what's new on the Dart website and blog.
 To see what's new in Flutter, visit the
 [Flutter what's new page.][flutter-whats-new]
 
-For a list of Dart language changes in each Dart SDK, see the 
+For a list of Dart language changes in each Dart SDK, see the
 [Dart changelog][dart-changelog].
 To stay on top of announcements, including breaking changes,
 join the [Dart announcements Google group][dart-announce]
@@ -29,31 +29,30 @@ For details about the 3.11 release of Dart,
 check out the [3.11 announcement][] and the
 [3.11 SDK changelog][3-11-changelog].
 
+[3.11 announcement]: https://blog.dart.dev/announcing-dart-3-11-b6529be4203a
+[3-11-changelog]: https://github.com/dart-lang/sdk/blob/main/CHANGELOG.md#3110
+
 ### Documentation updates {:.no_toc}
 
 *   Launched a new [getting started experience][learn] for learning Dart.
-*   Updated the [IntelliJ & Android Studio page][] following the transition 
+*   Updated the [IntelliJ & Android Studio page][] following the transition
     of the Dart plugin to the Dart team.
-*   Added documentation about the environment variables available 
+*   Added documentation about the environment variables available
     to Dart's [build hooks][].
-*   Included "Format on save" setup instructions for IDEs 
+*   Included "Format on save" setup instructions for IDEs
     on the [dart format][] page.
     (Thank you, [Anushree Bondia](https://github.com/Anushreebasics).)
 *   Expanded the [Glossary][] with new terms including "dependency graph",
     "AOT", "JIT", "interop", and "scope".
-    (Thank you, [IldySilva](https://github.com/IldySilva) 
+    (Thank you, [IldySilva](https://github.com/IldySilva)
     and [Anushree Bondia](https://github.com/Anushreebasics).)
 
-
-[3.11 announcement]: https://blog.dart.dev/announcing-dart-3-11-b6529be4203a
-[3-11-changelog]: https://github.com/dart-lang/sdk/blob/main/CHANGELOG.md#3110
 [learn]: /learn
 [Glossary]: /resources/glossary
 [IntelliJ & Android Studio page]: /tools/jetbrains-plugin
 [build hooks]: /tools/hooks
 [dart format]: /tools/dart-format
 
-
 ## 3.10 release
 
 _Released on: November 12, 2025_
@@ -64,6 +63,9 @@ For details about the 3.10 release of Dart,
 check out the [3.10 announcement][] and the
 [3.10 SDK changelog][3-10-changelog].
 
+[3.10 announcement]: https://blog.dart.dev/announcing-dart-3-10-ea8b952b6088
+[3-10-changelog]: https://github.com/dart-lang/sdk/blob/main/CHANGELOG.md#3100
+
 ### Documentation updates {:.no_toc}
 
 *   Added a guide for the new [dot shorthands][] language feature.
@@ -75,6 +77,13 @@ check out the [3.10 announcement][] and the
     "closurization", "callback", "tree shaking", and "native asset".
     (Thank you, [IldySilva](https://github.com/IldySilva))
 
+[dot shorthands]: /language/dot-shorthands
+[analyzer plugin]: /tools/analyzer-plugins
+[`dart build`]: /tools/dart-build
+[`dart install`]: /tools/dart-install
+[`@Deprecated` annotation]: /language/metadata
+[Glossary]: /resources/glossary
+
 ### Site improvements {:.no_toc}
 
 *   Migrated core site infrastructure to the [Jaspr framework][Jaspr migration]
@@ -85,22 +94,21 @@ check out the [3.10 announcement][] and the
     card-based layout.
 *   Started compiling client-side Dart code to [Wasm][Wasm compilation].
 
-[3.10 announcement]: https://blog.dart.dev/announcing-dart-3-10-ea8b952b6088
-[3-10-changelog]: https://github.com/dart-lang/sdk/blob/main/CHANGELOG.md
-[dot shorthands]: /language/dot-shorthands
-[analyzer plugin]: /tools/analyzer-plugins
-[`dart build`]: /tools/dart-build
-[`dart install`]: /tools/dart-install
-[`@Deprecated` annotation]: /language/metadata
-[Glossary]: /resources/glossary
-[IntelliJ & Android Studio page]: /tools/jetbrains-plugin
 [Jaspr migration]: https://jaspr.site
 [Table of Contents extension]: https://github.com/dart-lang/site-www/pull/6886
 [Glossary filtering]: https://github.com/dart-lang/site-www/pull/6945
 [Glossary tooltips]: https://github.com/dart-lang/site-www/pull/6969
 [Community page redesign]: https://github.com/dart-lang/site-www/pull/6900
 [Wasm compilation]: https://github.com/dart-lang/site-www/pull/6953
 
+### Articles added to the Dart blog {:.no_toc}
+
+We published the following articles on the Dart blog:
+
+* [Google Summer of Code 2025 Results][blog-10-21-25]
+
+[blog-10-21-25]: https://blog.dart.dev/google-summer-of-code-2025-results-596cf0a43422
+
 ## 3.9 release
 
 _Released on: August 13, 2025_
@@ -266,8 +274,8 @@ check out the [3.7 announcement][] and the [SDK changelog][3-7-changelog].
 In addition to bug fixes and incremental improvements,
 we made the following changes to this site:
 
-* Introduced the new type system algoritm, [inference using bounds][].
-* Added links to our new [Bluesky][] account. 
+* Introduced the new type system algorithm, [inference using bounds][].
+* Added links to our new [Bluesky][] account.
 * Updated the [`dart format`][] page to reflect the new formatter style,
   including the new [configurable line length][] feature.
 * Documented the new [shared analysis options][] feature.
@@ -276,13 +284,14 @@ we made the following changes to this site:
 * Introduced details of [stray files][] to the Workspaces page.
 * Added the new language feature [wildcard variables][] to the Variables page.
 * Moved [covariant explanation][] to the better-suited Type system page.
-* Changed references to [legacy JS interop][] libraries explicitly to "deprecated". 
-* Removed the experimental macros page, since the team [indefinitely paused][]
-  work on the feature.
-* Added a [warning][map-warn] that destructuring a Map pattern by a non-existent key will
-  throw a `StateError`.
-* Revamped the [linter rules][] page with new cards, search format, and color-coded
-  icons on the individual lint pages ([for example][]).
+* Changed references to the [legacy JS interop][]
+  libraries to be explicitly "deprecated".
+* Removed the experimental macros page, since the team
+  [indefinitely paused][] work on the feature.
+* Added a [warning][map-warn] that destructuring a Map pattern by
+  a non-existent key will throw a `StateError`.
+* Revamped the [linter rules][] page with new cards, search format, and
+  color-coded icons on the individual lint pages ([for example][]).
 * Redesigned the layout implementation and sidenav for efficiency.
 * Removed the officially-deprecated `dart:html` library page.