QObject: Optimize removeEventFilter

We can't have duplicated filters installed,
so break the loop when removing event filter after we
have found the matching one.

Pick-to: 6.7
Change-Id: Idda87f3090954e020b27bf3fab62677128607f03
Reviewed-by: Marc Mutz <marc.mutz@qt.io>

src/corelib/kernel/qobject.cpp

@@ -2375,9 +2375,11 @@ void QObject::removeEventFilter(QObject *obj)
 {
     Q_D(QObject);
     if (d->extraData) {
-        for (int i = 0; i < d->extraData->eventFilters.size(); ++i) {
-            if (d->extraData->eventFilters.at(i) == obj)
-                d->extraData->eventFilters[i] = nullptr;
+        for (auto &filter : d->extraData->eventFilters) {
+            if (filter == obj) {
+                filter = nullptr;
+                break;
+            }
         }
     }
 }