fix: perf containerNode => search in descendents / children

Author: Gorash

packages/core/src/VNodes/ContainerNode.ts

@@ -97,7 +97,7 @@ export class ContainerNode extends AbstractNode {
     firstDescendant(predicate?: Predicate): VNode;
     firstDescendant(predicate?: Predicate): VNode {
         let firstDescendant = this.firstChild();
-        while (firstDescendant && predicate && firstDescendant.test(predicate)) {
+        while (firstDescendant && predicate && !firstDescendant.test(predicate)) {
             firstDescendant = this._descendantAfter(firstDescendant);
         }
         return firstDescendant;