[TypeDeclaration] Handle return self on TypedPropertyFromStrictGetterMethodReturnTypeRector on php 8.0 feature enabled

[samsonasik]

Closes #3085

[samsonasik]

It seems cause error on DowngradeSelfTypeDeclarationRector:

 2) Rector\Tests\DowngradePhp70\Rector\ClassMethod\DowngradeSelfTypeDeclarationRector\DowngradeSelfTypeDeclarationRectorTest::test with data set #1 ('/home/runner/work/rector-src/...hp.inc')
Failed asserting that string matches format description.
--- Expected
+++ Actual
@@ @@
 
 class Fixture
 {
-    /**
-     * @return $this
-     */
-    public function getSelf()
+    public function getSelf(): self
     {
         return $this;
     }

The at least php version check possibly needed.

[samsonasik]

@TomasVotruba the patch seems needs to be in both here and rector-downgrade-php's PhpDocFromTypeDeclarationDecorator::decorateReturnWithSpecificType() which verify SelfStaticType

https://github.com/rectorphp/rector-downgrade-php/blob/d5a52d643513c66fc23270aa4748a564508ccc1d/src/PhpDocDecorator/PhpDocFromTypeDeclarationDecorator.php#L155

due to the mapper used in both:

• rector-src
• rector-downgrade-php

[samsonasik]

@TomasVotruba I created PR to rector-downgrade-php that required for it:

• [PhpDocDecorator] Handle SelfStaticType on DowngradeSelfTypeDeclarationRector rector-downgrade-php#28

that need to be merged first before this.

[samsonasik]

Build restarted

[samsonasik]

All checks have passed 🎉 @TomasVotruba I think it is ready.

[samsonasik]

Let's merge and verify scoped build

[samsonasik]

@TomasVotruba it works 🎉

[TomasVotruba]

Thank you 👏