docs: force Alpine to rerender when the selection updates

docs/src/docPages/installation/alpine.md

@@ -53,6 +53,7 @@ window.setupEditor = function(content) {
   return {
     editor: null,
     content: content,
+    updatedAt: Date.now(), // force Alpine to rerender on selection change
     init(element) {
       this.editor = new Editor({
         element: element,
@@ -61,6 +62,9 @@ window.setupEditor = function(content) {
         onUpdate: ({ editor }) => {
           this.content = editor.getHTML()
         },
+        onSelectionUpdate: () => {
+          this.updatedAt = Date.now()
+        },
       })
     },
   }