Fix GH-14480: Method visibility issue introduced in version 8.3.8

Zend/tests/gh14480.phpt

@@ -0,0 +1,60 @@
+--TEST--
+GH-14480: Method visibility issue
+--FILE--
+<?php
+trait PropertyHelperTrait
+{
+    protected function splitPropertyParts(): void
+    {
+	    echo "OK\n";
+    }
+}
+
+trait OrmPropertyHelperTrait
+{
+    abstract protected function splitPropertyParts(): void;
+
+    protected function addJoinsForNestedProperty(): void
+    {
+        $this->splitPropertyParts();
+    }
+}
+
+trait SearchFilterTrait
+{
+    use PropertyHelperTrait;
+}
+
+abstract class AbstractFilter
+{
+    use OrmPropertyHelperTrait, PropertyHelperTrait;
+
+    public function apply(): void
+    {
+        $this->filterProperty();
+    }
+
+    abstract protected function filterProperty(): void;
+}
+
+class SearchFilter extends AbstractFilter
+{
+    use SearchFilterTrait;
+    protected function filterProperty(): void
+    {
+        $this->addJoinsForNestedProperty();
+    }
+}
+
+class FilterExtension
+{
+    public function applyToCollection(): void
+    {
+        (new SearchFilter())->apply();
+    }
+}
+
+(new FilterExtension)->applyToCollection();
+?>
+--EXPECT--
+OK

Zend/zend_inheritance.c

@@ -1933,11 +1933,13 @@ static void zend_add_trait_method(zend_class_entry *ce, zend_string *name, zend_
 	if (check_inheritance) {
 		/* Inherited members are overridden by members inserted by traits.
 		 * Check whether the trait method fulfills the inheritance requirements. */
+		uint32_t flags = ZEND_INHERITANCE_CHECK_PROTO | ZEND_INHERITANCE_CHECK_VISIBILITY;
+		if (!(existing_fn->common.scope->ce_flags & ZEND_ACC_TRAIT)) {
+			flags |= ZEND_INHERITANCE_SET_CHILD_CHANGED |ZEND_INHERITANCE_SET_CHILD_PROTO;
+		}
 		do_inheritance_check_on_method(
 			fn, fixup_trait_scope(fn, ce), existing_fn, fixup_trait_scope(existing_fn, ce),
-			ce, NULL,
-			ZEND_INHERITANCE_CHECK_PROTO | ZEND_INHERITANCE_CHECK_VISIBILITY |
-			ZEND_INHERITANCE_SET_CHILD_CHANGED| ZEND_INHERITANCE_SET_CHILD_PROTO);
+			ce, NULL, flags);
 	}
 }
 /* }}} */