[TomasVotruba]

Fixes rectorphp/rector#9957

RemoveDefaultValueFromAssignedPropertyRector wrongly removed a property default when the only assign lived inside a nested if/else that is itself wrapped in an outer conditional:

final class DemoFile
{
    private string $a = '';

    public function __construct(bool $value)
    {
        if ($value) {
            if (mt_rand(0, 1)) {
                $this->a = 'a';
            } else {
                $this->a = 'b';
            }
        }

        echo $this->a;
    }
}

The outer if can skip the whole block, so the property is not guaranteed to be assigned. Removing the default produced:

Typed property DemoFile::$a must not be accessed before initialization

ConstructorAssignDetector::isIfElseAssign() treated any if/else where both branches assign as guaranteed, ignoring that the if was nested. The fix only counts the if/else when it is a first-level statement of the constructor, matching the existing guard used for direct assigns.