Address @robinlinden comments 2

.bcr/presubmit.yml

@@ -1,26 +1,42 @@
 matrix:
-  # Note that gcc 9 and earlier aren't supported due to using --std=c++2a
-  # instead of --std=c++20
-  platform:
-  - debian11
-  - ubuntu2204
-  - macos
-  - macos-arm64
-  - windows
   bazel:
-  #- 6.x -> Build fails with bazel 6.x
-  - 7.x
-  - 8.x
+    - 7.x
+    - 8.x
+    - rolling
+  unix_platform:
+    - debian11
+    - ubuntu2204
+    - macos
+    - macos_arm64
+  win_platform:
+    - windows
+
 tasks:
-  verify_targets:
-    name: Build and test.
-    platform: ${{ platform }}
+
+  unix_test:
+    name: Verify build targets on Unix
+    platform: ${{ unix_platform }}
     bazel: ${{ bazel }}
+    build_flags:
+    - --cxxopt=-std=c++17
     build_targets:
-    - '@ftxui//:ftxui'
-    - '@ftxui//:screen'
     - '@ftxui//:dom'
     - '@ftxui//:component'
+    - '@ftxui//:screen'
     test_targets:
     - '@ftxui//:tests'
 
+  windows_test:
+    name: Verify build targets
+    platform: ${{ win_platform }}
+    bazel: ${{ bazel }}
+    build_flags:
+    - --cxxopt=/std:c++17
+    build_targets:
+    - '@ftxui//:dom'
+    - '@ftxui//:component'
+    - '@ftxui//:screen'
+    test_targets:
+    - '@ftxui//:tests'
+
+