SwiftLint recommends a double run when fixing

https://github.com/realm/SwiftLint#xcode recommends
> If you wish to fix violations as well, your script could run `swiftlint --fix && swiftlint` instead of just `swiftlint`. This will mean that all correctable violations are fixed while ensuring warnings show up in your project for remaining violations.

https://github.com/realm/SwiftLint#auto-correct
> Standard linting is disabled while correcting because of the high likelihood of violations (or their offsets) being incorrect after modifying a file while applying corrections.

Author: cclauss

.github/workflows/macOS-tests.yml

@@ -42,7 +42,10 @@ jobs:
       - name: SwiftLint
         run: |
           # Adding --fix flag makes CI print only errors that cannot be fixed automatically
-          swiftlint --fix
+          # 1. Make automated fixes that are possible
+          # 2. git diff to see what automated fixes were made
+          # 3. See https://github.com/realm/SwiftLint#xcode explains why the double run
+          swiftlint --fix && git diff && swiftlint
       - name: Resolve dependencies
         run: swift package resolve
       - name: Build