Fixing missing blank line at end of modified patch files

Author: weaverryan

src/Update/DiffHelper.php

@@ -35,6 +35,11 @@ public static function removeFilesFromPatch(string $patch, array $files, array &
             $patch = $contentBefore.substr($patch, $end);
         }
 
+        // valid patches end with a blank line
+        if ($patch && "\n" !== substr($patch, \strlen($patch) - 1, 1)) {
+            $patch = $patch."\n";
+        }
+
         return $patch;
     }
 }

tests/Update/DiffHelperTest.php

@@ -105,6 +105,7 @@ public function getRemoveFilesFromPatchTests(): iterable
 +    dbal:
 +        # "TEST_TOKEN" is typically set by ParaTest
 +        dbname_suffix: '_test%env(default::TEST_TOKEN)%'
+
 EOF
             , [
                 '.env' => <<<EOF
@@ -154,6 +155,7 @@ public function getRemoveFilesFromPatchTests(): iterable
 +    dbal:
 +        # "TEST_TOKEN" is typically set by ParaTest
 +        dbname_suffix: '_test%env(default::TEST_TOKEN)%'
+
 EOF
             , [
                 'config/packages/doctrine.yaml' => <<<EOF
@@ -204,6 +206,7 @@ public function getRemoveFilesFromPatchTests(): iterable
 -            type: pool
 -            pool: doctrine.system_cache_pool
          query_cache_driver:
+
 EOF
             , [
                 'config/packages/test/doctrine.yaml' => <<<EOF
@@ -244,6 +247,7 @@ public function getRemoveFilesFromPatchTests(): iterable
 -            type: pool
 -            pool: doctrine.system_cache_pool
          query_cache_driver:
+
 EOF
             , [
                 'config/packages/test/doctrine.yaml' => <<<EOF