Fix validation of modified sparse ASTs (#1105)

Author: spawnia

CHANGELOG.md

@@ -116,6 +116,12 @@ You can find and compare releases at the [GitHub release page](https://github.co
 - Remove `Utils::find()`, `Utils::every()` and `Utils::invariant()`
 - Remove argument `bool $exitWhenDone` from `StandardServer::send500Error()` and `StandardServer::handleRequest()`
 
+## 14.11.6
+
+### Fixed
+
+- Fix validation of modified sparse ASTs
+
 ## 14.11.5
 
 ### Fixed

src/Validator/QueryValidationContext.php

@@ -209,8 +209,7 @@ public function getFragmentSpreads(HasSelectionSet $node): array
             while (count($setsToVisit) > 0) {
                 $set = array_pop($setsToVisit);
 
-                for ($i = 0, $selectionCount = count($set->selections); $i < $selectionCount; ++$i) {
-                    $selection = $set->selections[$i];
+                foreach ($set->selections as $selection) {
                     if ($selection instanceof FragmentSpreadNode) {
                         $spreads[] = $selection;
                     } else {