fix(ci): build macOS arm64 with Flutter 3.44 (#16821)

* fix(ci): build macOS arm64 with Flutter 3.44

Flutter 3.24.5's macOS engine can crash in attributedSubstringForProposedRange
with an out-of-bounds range on an empty string (#16817). The fix
(flutter/flutter#153157) landed after 3.24 and was never cherry-picked, and
3.44 has the bounds check. So macOS arm64 now builds with Flutter 3.44.9, the
same way Windows arm64 does: the 3.44 bridge artifact and the shared source
patch script. The script uses GNU `sed -i`, which BSD sed on macOS rejects,
so the step puts GNU sed first on PATH. The 3.24 dropdown patch is skipped,
because 3.44 already has that fix.

macOS x86_64 stays on 3.24.5: 3.44's FlutterMacOS needs macOS 10.15 there,
and the build targets 10.14. The Dart tests move to the x86_64 job, so CI
still runs them against the 3.24.5 sources that most platforms ship.

Refs #16817

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(ci): keep CocoaPods on macOS arm64 and run Dart tests on both arches

Flutter 3.44 turns on Swift Package Manager by default. On the first
`flutter build macos` it would migrate Runner.xcodeproj and Runner.xcscheme,
and build file_selector_macos, path_provider_foundation, url_launcher_macos
and video_player_avfoundation through SwiftPM while the other 12 plugins stay
on CocoaPods. If the migration fails, the build fails. All 16 macOS plugins
still ship a podspec, so turning SwiftPM off keeps arm64 on the CocoaPods-only
path the 3.24.5 build uses, and this change only swaps the engine.

The Dart tests now run on both macOS jobs: x86_64 covers the 3.24.5 sources
most platforms ship, and arm64 covers the patched 3.44 sources it ships.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* ci: update comments that still call Windows arm64 the only Flutter 3.44 build

The FLUTTER_WINDOWS_ARM_VERSION note, the Windows source-patch step and the
header of apply_flutter_3.44_source_patches.sh still said Windows arm64 is
the only Flutter 3.44 target. They now mention macOS arm64 too, and the
script header records that macOS needs GNU sed for its `sed -i` calls.
Comments only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test: make test_RustDesk_interval_sleep deterministic

The test recorded tick times as wall-clock seconds, rounded to the nearest
second, and asserted all 5 were unique. If the runner stalled for close to a
second, two correct ticks rounded to the same value and the test failed
(macOS arm64 CI on #16821: left 5, right 4).

It now runs on tokio's paused clock and checks what ThrottledInterval
guarantees: ticks are at least 0.9 * period apart. A plain tokio interval
bursts its missed ticks with no gap, so a lost throttle still fails. This
needs tokio's test-util feature for the existing dev-dependency. It adds no
crates, so Cargo.lock is unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/flutter-build.yml

@@ -31,10 +31,15 @@ env:
   FLUTTER_VERSION: "3.24.5"
   ANDROID_FLUTTER_VERSION: "3.24.5"
   # Windows arm64 only: the first stable Flutter to ship a native arm64 Windows Dart SDK +
-  # engine is 3.44. Every other platform stays on FLUTTER_VERSION (3.24.5) until Windows 7
-  # support is restored after the upstream-wide Flutter bump. The arm64 job patches the few
-  # 3.44-only source/pubspec changes on the fly (see "Patch RustDesk sources for Flutter 3.44").
+  # engine is 3.44. Every other platform except macOS arm64 (below) stays on FLUTTER_VERSION
+  # (3.24.5) until Windows 7 support is restored after the upstream-wide Flutter bump. The 3.44
+  # jobs patch the few 3.44-only source/pubspec changes on the fly (see "Patch RustDesk sources
+  # for Flutter 3.44").
   FLUTTER_WINDOWS_ARM_VERSION: "3.44.9"
+  # macOS arm64 only: 3.24.5's engine crashes in attributedSubstringForProposedRange
+  # (https://github.com/rustdesk/rustdesk/issues/16817, https://github.com/flutter/flutter/issues/153157).
+  # x86_64 stays on FLUTTER_VERSION: 3.44's FlutterMacOS needs macOS 10.15 there, and it targets 10.14.
+  FLUTTER_MACOS_ARM_VERSION: "3.44.9"
   # for arm64 linux because official Dart SDK does not work
   FLUTTER_ELINUX_VERSION: "3.16.9"
   TAG_NAME: "${{ inputs.upload-tag }}"
@@ -273,8 +278,9 @@ jobs:
           fi
 
       - name: Patch RustDesk sources for Flutter 3.44 (arm64)
-        # arm64 is the only target on Flutter 3.44; apply its source/pubspec deltas on the fly
-        # (shared with the 3.44 bridge job) so the committed sources stay on Flutter 3.24.5.
+        # arm64 is on Flutter 3.44 (as is macOS arm64); apply its source/pubspec deltas on the fly
+        # (shared with the macOS arm64 build and the 3.44 bridge job) so the committed sources
+        # stay on Flutter 3.24.5.
         # `flutter build` then runs `pub get`, regenerating pubspec.lock for the bumped deps.
         if: ${{ matrix.job.arch == 'aarch64' }}
         shell: bash
@@ -1004,9 +1010,17 @@ jobs:
         uses: subosito/flutter-action@1a449444c387b1966244ae4d4f8c696479add0b2 # v2
         with:
           channel: "stable"
-          flutter-version: ${{ env.FLUTTER_VERSION }}
+          flutter-version: ${{ matrix.job.arch == 'aarch64' && env.FLUTTER_MACOS_ARM_VERSION || env.FLUTTER_VERSION }}
+
+      - name: Keep CocoaPods for Flutter 3.44 (arm64)
+        # 3.44 turns on Swift Package Manager by default, which would migrate Runner.xcodeproj and
+        # move some plugins off CocoaPods; every plugin still ships a podspec.
+        if: ${{ matrix.job.arch == 'aarch64' }}
+        run: flutter config --no-enable-swift-package-manager
 
       - name: Patch flutter
+        # Flutter 3.44 (arm64) already has this dropdown fix.
+        if: ${{ matrix.job.arch == 'x86_64' }}
         run: |
           cd $(dirname $(dirname $(which flutter)))
           if [[ "3.24.5" == ${{env.FLUTTER_VERSION}} ]]; then
@@ -1021,6 +1035,15 @@ jobs:
           sed -i -e 's/_setFramesEnabledState(false);/\/\/_setFramesEnabledState(false);/g' ../packages/flutter/lib/src/scheduler/binding.dart
           grep -n '_setFramesEnabledState(false);' ../packages/flutter/lib/src/scheduler/binding.dart
 
+      - name: Patch RustDesk sources for Flutter 3.44 (arm64)
+        # The script uses GNU `sed -i`, which macOS's BSD sed rejects.
+        if: ${{ matrix.job.arch == 'aarch64' }}
+        shell: bash
+        run: |
+          brew install gnu-sed
+          export PATH="$(brew --prefix gnu-sed)/libexec/gnubin:$PATH"
+          bash .github/patches/apply_flutter_3.44_source_patches.sh
+
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # v1
         with:
@@ -1035,11 +1058,13 @@ jobs:
       - name: Restore bridge files
         uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
-          name: bridge-artifact
+          # arm64's *.freezed.dart must match the freezed it resolves under Flutter 3.44.
+          name: ${{ matrix.job.arch == 'aarch64' && 'bridge-artifact-flutter-3.44' || 'bridge-artifact' }}
           path: ./
 
       - name: Run the Dart tests
-        if: ${{ !inputs.upload-artifact && matrix.job.arch == 'aarch64' }}
+        # x86_64 tests the Flutter 3.24.5 sources most platforms ship, arm64 the patched 3.44 ones.
+        if: ${{ !inputs.upload-artifact }}
         working-directory: flutter
         run: flutter test --timeout 60s