[Scoper] Skip vendor/composer/composer for prefixing (#6291)

* [Scoper] Skip vendor/composer/composer for prefixing

* on Composer\Plugin

.github/workflows/build_scoped_rector_php70.yaml

@@ -39,6 +39,7 @@ jobs:
 
             # 1. (a) copy files to $NESTED_DIRECTORY directory Exclude the scoped/nested directories to prevent rsync from copying in a loop
             -  run: rsync --exclude rector-build-php70 -av * rector-build-php70 --quiet
+            -  run: rm -rf rector-build-php70/packages-tests rector-build-php70/rules-tests rector-build-php70/tests
 
             # 2. downgrade rector
             -   run: sh build/downgrade-rector-php70.sh rector-build-php70
@@ -46,9 +47,6 @@ jobs:
             # 3. prefix classes
             -   run: sh build/build-rector-scoped.sh rector-build-php70 rector-prefixed-downgraded-php70
 
-            # 1. (b) remove tests directory after run scoped
-            -  run: rm -rf rector-build-php70/packages-tests rector-build-php70/rules-tests rector-build-php70/tests
-
             # 4. lint the code for PHP 7.0 - this must happen here, as setup-php allows only one PHP version switch: https://github.com/shivammathur/setup-php/issues/434
             -
                 uses: shivammathur/setup-php@v2

scoper.php

@@ -69,6 +69,18 @@ return [
             );
         },
 
+        function (string $filePath, string $prefix, string $content): string {
+            if (! Strings::contains($content, $prefix . '\Composer\Plugin')) {
+                return $content;
+            }
+
+            return Strings::replace(
+                $content, '
+                #' . $prefix . '\\\\Composer\\\\Plugin#',
+                'Composer\Plugin'
+            );
+        },
+
         // get version for prefixed version
         function (string $filePath, string $prefix, string $content): string {
             if (! Strings::endsWith($filePath, 'src/Configuration/Configuration.php')) {