Trying something

.github/workflows/area_matrix.yml

@@ -0,0 +1,27 @@
+name: _
+
+on:
+  workflow_call:
+    inputs:
+      sdk:
+        required: true
+        type: string
+
+jobs:
+  setup:
+    uses: ./.github/workflows/setup.yml
+    with:
+      sdk: ${{ inputs.sdk }}
+  lib:
+    needs: [ setup ]
+    if: ${{ needs.setup.outputs.run_dart_checks == 'true' }}
+    uses: ./.github/workflows/lib_ci.yml
+    with:
+      sdk: ${{ inputs.sdk }}
+      is_tag_build: ${{ needs.setup.outputs.is_tag_build }}
+  analyzer_plugin:
+    needs: [ setup ]
+    if: ${{ needs.setup.outputs.is_tag_build == 'false' && needs.setup.outputs.run_dart_checks == 'true' }}
+    uses: ./.github/workflows/plugin_ci.yml
+    with:
+      sdk: ${{ inputs.sdk }}

.github/workflows/dart_ci.yml

@@ -16,6 +16,6 @@ jobs:
       matrix:
         # Can't run on `dev` (Dart 3) until we're fully null-safe.
         sdk: [ 2.18.7, 2.19.6 ]
-    uses: ./.github/workflows/jobs.yml
+    uses: ./.github/workflows/dart_ci_matrix.yml
     with:
       sdk: ${{ matrix.sdk }}

.github/workflows/dart_ci_matrix.yml

@@ -0,0 +1,17 @@
+name: Dart
+
+on:
+  workflow_call:
+    inputs:
+      sdk:
+        required: true
+        type: string
+
+jobs:
+  strategy:
+    fail-fast: false
+    matrix:
+      area: [ lib, plugin ]
+  uses: ./.github/workflows/area_matrix.yml
+  with:
+    sdk: ${{ matrix.sdk }}