CI: Flutter 2.2.0 requires Visual Studio 2019.

Author: greenrobot-team

.github/workflows/dart.yml

@@ -91,27 +91,33 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - windows-2022
           - macos-11
           - ubuntu-20.04
         flutter-version:
           - 3.0.0
           - 2.2.0
           # 2.0.0 technically lowest supported, but need 2.2.0 to correctly resolve null safety dependencies.
           # https://github.com/flutter/flutter/issues/77282
+        include:
+          - flutter-version: 3.0.0 # Flutter 2.9 and newer need Visual Studio 2022 to build desktop.
+            os: windows-2022
+          - flutter-version: 2.2.0 # Flutter 2.8.1 and older need Visual Studio 2019 to build desktop.
+            os: windows-2019
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
       - uses: subosito/flutter-action@v2
         with:
           flutter-version: ${{ matrix.flutter-version }}
           cache: true
-      - uses: actions/setup-java@v2 # macos-10.15 and windows-2019 default to Java 8, but Android Plugin requires 11
+      # macos-11 and windows-2019/2022 default to Java 8, but Android Plugin requires 11.
+      - uses: actions/setup-java@v2
         with:
           distribution: 'temurin'
           java-version: '11'
       - run: echo $PATH
       - run: flutter --version
+      # https://docs.flutter.dev/desktop#additional-linux-requirements
       - if: ${{ startsWith(matrix.os, 'ubuntu') }}
         run: ./tool/apt-install.sh ninja-build pkg-config libgtk-3-dev
       - run: make integration-test