refactor(MultiSelect): improve update method

Author: mrholek

js/src/multi-select.js

@@ -242,7 +242,11 @@ class MultiSelect extends BaseComponent {
   }
 
   update(config) {
-    this._config = this._getConfig(config)
+    if (config.value) {
+      this.deselectAll()
+    }
+
+    this._config = { ...this._config, ...this._configAfterMerge(config) }
     this._selected = []
     this._options = this._getOptions()
     this._menu.remove()
@@ -435,17 +439,19 @@ class MultiSelect extends BaseComponent {
 
     for (const node of nodes) {
       if (node.nodeName === 'OPTION' && node.value) {
+        const value = String(node.value)
+        const text = node.innerHTML
         const isSelected = node.selected || (this._config.value && this._config.value.includes(node.value))
         options.push({
-          value: node.value,
-          text: node.innerHTML,
+          value,
+          text,
           selected: isSelected,
           disabled: node.disabled
         })
 
         if (node.selected || isSelected) {
           this._selected.push({
-            value: node.value,
+            value,
             text: node.innerHTML,
             ...node.disabled && { disabled: true }
           })