chore(repo): bump min Flutter to 3.44.0 and Dart SDK to 3.12.0

Per the SDK's "minimum supported = latest stable - 1" policy, Flutter
3.47.0 shipping on 2026-08-12 makes 3.44.0 (Dart 3.12.0) the new floor.
Following #2721/#2108/#2068, a floor raise is not marked breaking:
existing code keeps compiling, older SDKs simply stop resolving the new
version, and the CHANGELOG bullet goes under Changed rather than
Breaking.

Moves the three version knobs that must stay in lockstep — melos.yaml
(source of truth), .fvmrc, and legacy_version_analyze.yml's
flutter_version — plus the 13 pubspecs melos propagates to.

Raising the Dart constraint also raises each package's language version,
which activated `prefer_initializing_formals` on previously-silent
sites: Dart 3.12 legalised `this._privateField` as a named parameter, so
the lint's suggested fix only became expressible now. Applied via
`dart fix --apply --code=prefer_initializing_formals`, verified by hand:

- No doc comment was rewritten or dropped by the refactor.
- Every introduced `this._foo` replaced a parameter named exactly `foo`,
  so no public call site changes. Assignments whose names differ or
  carry a default (`_provider = tokenProvider`, `_locationProvider =
  locationProvider ?? LocationProvider()`) were correctly left alone.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: xsahil03x

.fvmrc

@@ -1,3 +1,3 @@
 {
-  "flutter": "3.41.0"
+  "flutter": "3.44.0"
 }

.github/workflows/legacy_version_analyze.yml

@@ -3,7 +3,7 @@ name: legacy_version_analyze
 env:
   # Note: The versions below should be manually updated after a new stable
   # version comes out.
-  flutter_version: "3.41.0"
+  flutter_version: "3.44.0"
 
 on:
   push:

docs/docs_screenshots/pubspec.yaml

@@ -11,8 +11,8 @@ publish_to: none
 #   2. Run `melos bootstrap` to apply changes.
 
 environment:
-  sdk: ^3.11.0
-  flutter: ">=3.41.0"
+  sdk: ^3.12.0
+  flutter: ">=3.44.0"
 
 dependencies:
   flutter:

melos.yaml

@@ -24,9 +24,9 @@ command:
 
     # Dart and Flutter environment used in the project.
     environment:
-      sdk: ^3.11.0
+      sdk: ^3.12.0
       # We are not using carat '^' syntax here because flutter don't follow semantic versioning.
-      flutter: ">=3.41.0"
+      flutter: ">=3.44.0"
 
     # List of all the dependencies used in the project.
     dependencies:

packages/stream_chat/CHANGELOG.md

@@ -14,6 +14,7 @@
 🔄 Changed
 
 - Raised the minimum `dio` version to `^5.11.0`.
+- Raised minimum Dart SDK to `^3.12.0`.
 
 🐞 Fixed
 

packages/stream_chat/example/pubspec.yaml

@@ -17,8 +17,8 @@ version: 1.0.0+1
 #   2. Add it to the melos.yaml file for future updates.
 
 environment:
-  sdk: ^3.11.0
-  flutter: ">=3.41.0"
+  sdk: ^3.12.0
+  flutter: ">=3.44.0"
 
 dependencies:
   cupertino_icons: ^1.0.3

packages/stream_chat/lib/src/client/channel_delivery_reporter.dart

@@ -29,11 +29,10 @@ class ChannelDeliveryReporter {
   ///
   /// The optional [logger] logs warnings and errors during operation.
   ChannelDeliveryReporter({
-    Logger? logger,
+    this._logger,
     required this.onMarkChannelsDelivered,
     Duration throttleDuration = const Duration(seconds: 1),
-  }) : _logger = logger,
-       _markAsDeliveredThrottleDuration = throttleDuration;
+  }) : _markAsDeliveredThrottleDuration = throttleDuration;
 
   final Logger? _logger;
   final Duration _markAsDeliveredThrottleDuration;

packages/stream_chat/lib/src/client/client.dart

@@ -100,9 +100,9 @@ class StreamChatClient {
     AttachmentFileUploaderProvider attachmentFileUploaderProvider = StreamAttachmentFileUploader.new,
     Iterable<Interceptor>? chatApiInterceptors,
     HttpClientAdapter? httpClientAdapter,
-    bool recoverStateOnReconnect = true,
+    this._recoverStateOnReconnect = true,
     this.isLocalUnreadCountEnabled = false,
-  }) : _recoverStateOnReconnect = recoverStateOnReconnect {
+  }) {
     logger.info('Initiating new StreamChatClient');
 
     final options = StreamHttpClientOptions(

packages/stream_chat/lib/src/core/api/sort_order.dart

@@ -53,7 +53,7 @@ class SortOption<T extends ComparableFieldProvider> {
   const SortOption.desc(
     this.field, {
     NullOrdering? nullOrdering,
-    Comparator<T>? comparator,
+    this._comparator,
   }) : direction = SortOption.DESC,
        // The server orders pinned_at and last_message_at NULLS LAST whichever
        // direction they are sorted in, so pinned and message-less channels
@@ -63,8 +63,7 @@ class SortOption<T extends ComparableFieldProvider> {
            nullOrdering ??
            (field == ChannelSortKey.pinnedAt || field == ChannelSortKey.lastMessageAt
                ? NullOrdering.nullsLast
-               : NullOrdering.nullsFirst),
-       _comparator = comparator;
+               : NullOrdering.nullsFirst);
 
   /// Creates a SortOption for ascending order sorting by the specified field.
   ///
@@ -76,12 +75,11 @@ class SortOption<T extends ComparableFieldProvider> {
   const SortOption.asc(
     this.field, {
     NullOrdering? nullOrdering,
-    Comparator<T>? comparator,
+    this._comparator,
   }) : direction = SortOption.ASC,
        // Every field the server sorts ascending orders nulls last, either
        // explicitly or by inheriting the default.
-       nullOrdering = nullOrdering ?? NullOrdering.nullsLast,
-       _comparator = comparator;
+       nullOrdering = nullOrdering ?? NullOrdering.nullsLast;
 
   /// Creates a [SortOption] from its JSON-serialized representation.
   ///

packages/stream_chat/lib/src/core/error/stream_chat_error.dart

@@ -83,12 +83,11 @@ class StreamChatNetworkError extends StreamChatError {
     int? statusCode,
     this.data,
     StackTrace? stacktrace,
-    @Deprecated('Set type to StreamChatNetworkErrorType.cancel instead') bool? isRequestCancelledError,
+    @Deprecated('Set type to StreamChatNetworkErrorType.cancel instead') this._isRequestCancelledError,
     this.type = .unknown,
   }) : code = errorCode.code,
        statusCode = statusCode ?? data?.statusCode,
        stackTrace = stacktrace ?? StackTrace.current,
-       _isRequestCancelledError = isRequestCancelledError,
        super(errorCode.message);
 
   /// Creates a [StreamChatNetworkError] from raw values.
@@ -98,10 +97,9 @@ class StreamChatNetworkError extends StreamChatError {
     this.statusCode,
     this.data,
     StackTrace? stacktrace,
-    @Deprecated('Set type to StreamChatNetworkErrorType.cancel instead') bool? isRequestCancelledError,
+    @Deprecated('Set type to StreamChatNetworkErrorType.cancel instead') this._isRequestCancelledError,
     this.type = .unknown,
   }) : stackTrace = stacktrace ?? StackTrace.current,
-       _isRequestCancelledError = isRequestCancelledError,
        super(message);
 
   /// Creates a [StreamChatNetworkError] from a [DioException].