Revert "Fixed #5463 - Splitter/SplitterPanel: size not updated"

This reverts commit cd18096e89.

components/lib/splitter/Splitter.vue

@@ -2,7 +2,6 @@
     <div :class="cx('root')" :style="sx('root')" :data-p-resizing="false" v-bind="ptmi('root', getPTOptions)">
         <template v-for="(panel, i) of panels" :key="i">
             <component :is="panel" tabindex="-1"></component>
-
             <div
                 v-if="i !== panels.length - 1"
                 ref="gutter"
@@ -52,20 +51,6 @@ export default {
         };
     },
     mounted() {
-        this.initializePanels();
-    },
-    updated() {
-        this.initializePanels();
-    },
-    beforeUnmount() {
-        this.clear();
-        this.unbindMouseListeners();
-    },
-    methods: {
-        isSplitterPanel(child) {
-            return child.type.name === 'SplitterPanel';
-        },
-        initializePanels() {
         if (this.panels && this.panels.length) {
             let initialized = false;
 
@@ -90,6 +75,14 @@ export default {
             }
         }
     },
+    beforeUnmount() {
+        this.clear();
+        this.unbindMouseListeners();
+    },
+    methods: {
+        isSplitterPanel(child) {
+            return child.type.name === 'SplitterPanel';
+        },
         onResizeStart(event, index, isKeyDown) {
             this.gutterElement = event.currentTarget || event.target.parentElement;
             this.size = this.horizontal ? DomHandler.getWidth(this.$el) : DomHandler.getHeight(this.$el);