bug #33335 [DependencyInjection] Fixed the `getServiceIds` implementation to always return aliases (pdommelen)

This PR was squashed before being merged into the 3.4 branch (closes #33335).

Discussion
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[DependencyInjection] Fixed the `getServiceIds` implementation to always return aliases

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | maybe
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #33307
| License       | MIT
| Doc PR        | -

Changed the getServiceIds implementation in the Container base class to include aliases. Modified existing tests. Added test which uses the PhpDumper.
Fixes https://github.com/symfony/symfony/issues/33307

Without this patch the implementations of the container are inconsistent in whether or not they return aliases (see issue). Fixing this could be considered a BC break for the affected Container class.

As an alternative to keep the behaviour in Container unchanged, the dumped container could be patched instead. And then only apply this version of the patch to master. This however keeps the inconsistency between Container and ContainerBuilder.

Commits
-------

834d5cbce2 [DependencyInjection] Fixed the `getServiceIds` implementation to always return aliases

src/Symfony/Component/DependencyInjection/Container.php

@@ -405,7 +405,7 @@ class Container implements ResettableContainerInterface
         }
         $ids[] = 'service_container';
 
-        return array_map('strval', array_unique(array_merge($ids, array_keys($this->methodMap), array_keys($this->fileMap), array_keys($this->services))));
+        return array_map('strval', array_unique(array_merge($ids, array_keys($this->methodMap), array_keys($this->fileMap), array_keys($this->aliases), array_keys($this->services))));
     }
 
     /**

src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php

@@ -156,7 +156,7 @@ class ContainerTest extends TestCase
 
         $sc = new ProjectServiceContainer();
         $sc->set('foo', $obj = new \stdClass());
-        $this->assertEquals(['service_container', 'internal', 'bar', 'foo_bar', 'foo.baz', 'circular', 'throw_exception', 'throws_exception_on_service_configuration', 'internal_dependency', 'foo'], $sc->getServiceIds(), '->getServiceIds() returns defined service ids by factory methods in the method map, followed by service ids defined by set()');
+        $this->assertEquals(['service_container', 'internal', 'bar', 'foo_bar', 'foo.baz', 'circular', 'throw_exception', 'throws_exception_on_service_configuration', 'internal_dependency', 'alias', 'foo'], $sc->getServiceIds(), '->getServiceIds() returns defined service ids by factory methods in the method map, followed by service ids defined by set()');
     }
 
     /**
@@ -168,7 +168,7 @@ class ContainerTest extends TestCase
         $sc = new LegacyProjectServiceContainer();
         $sc->set('foo', $obj = new \stdClass());
 
-        $this->assertEquals(['internal', 'bar', 'foo_bar', 'foo.baz', 'circular', 'throw_exception', 'throws_exception_on_service_configuration', 'service_container', 'foo'], $sc->getServiceIds(), '->getServiceIds() returns defined service ids by getXXXService() methods, followed by service ids defined by set()');
+        $this->assertEquals(['internal', 'bar', 'foo_bar', 'foo.baz', 'circular', 'throw_exception', 'throws_exception_on_service_configuration', 'service_container', 'alias', 'foo'], $sc->getServiceIds(), '->getServiceIds() returns defined service ids by getXXXService() methods, followed by service ids defined by set()');
     }
 
     public function testSet()

src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php

@@ -1139,6 +1139,30 @@ class PhpDumperTest extends TestCase
         $this->assertTrue($container->has('foo'));
         $this->assertSame('some value', $container->get('foo'));
     }
+
+    public function testAliasCanBeFoundInTheDumpedContainerWhenBothTheAliasAndTheServiceArePublic()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('foo', 'stdClass')->setPublic(true);
+        $container->setAlias('bar', 'foo')->setPublic(true);
+
+        $container->compile();
+
+        // Bar is found in the compiled container
+        $service_ids = $container->getServiceIds();
+        $this->assertContains('bar', $service_ids);
+
+        $dumper = new PhpDumper($container);
+        $dump = $dumper->dump(['class' => 'Symfony_DI_PhpDumper_AliasesCanBeFoundInTheDumpedContainer']);
+        eval('?>'.$dump);
+
+        $container = new \Symfony_DI_PhpDumper_AliasesCanBeFoundInTheDumpedContainer();
+
+        // Bar should still be found in the compiled container
+        $service_ids = $container->getServiceIds();
+        $this->assertContains('bar', $service_ids);
+    }
 }
 
 class Rot13EnvVarProcessor implements EnvVarProcessorInterface