Fix ConflictingTraitConstantsRule when trait constants reference class constants

Author: liquid207

src/Rules/Traits/ConflictingTraitConstantsRule.php

@@ -43,6 +43,12 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 
+		// Even though isInClass() is true, we still need to check isInTrait() because
+		// both can be true simultaneously when analyzing trait code.
+		if ($scope->isInTrait()) {
+			return [];
+		}
+
 		$classReflection = $scope->getClassReflection();
 		$traitConstants = [];
 		foreach ($classReflection->getTraits(true) as $trait) {

tests/PHPStan/Rules/Traits/data/conflicting-trait-constants.php

@@ -103,3 +103,21 @@ class Bar10
 
 	final public const PUBLIC_FINAL_CONSTANT = 1;
 }
+
+trait Foo1
+{
+	protected const ARR1 = [
+		self::KEY => 'int',
+	];
+}
+
+class Bar11
+{
+	use Foo1;
+
+	protected const KEY = 'k1';
+
+	protected const ARR = self::ARR1 + [
+		'a.b' => 'int',
+	];
+}