[FIX] web_editor: fix the linktools editing behaviour

Steps to reproduce:

- Go to website (Homepage) > Switch to "Edit" mode.
- double-click the "Contact Us" button in the header or keep clicking it
many times > Traceback: Cannot read properties of undefined (reading
'find')...

After converting the `linktools` widget to Owl in [1], the DOM element
of the component [2] was retrieved in an async process after it was
mounted, (some legacy code can trigger the instantiation of the
`linktools` when its parent component is not in the DOM and
`this.linkComponentWrapperRef.el` won't be returned, see: `Link` >
`onMounted`).

When double-clicking the link, This implementation will lead to a race
condition where the `onWillUpdateProps()` (mainly triggered by the click
to focus the URL input...) will try to access the DOM element from [2]
before being correctly set in `onMounted()`.

The goal of this commit is to fix this behaviour by simply waiting for
`onMounted` changes to be done before doing any adaptation on the
`linktools` DOM.

[1]: https://github.com/odoo/odoo/commit/d7245d2abf528d093226c80e40975e63d61e8997

opw-3706902

closes odoo/odoo#155418

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/js/wysiwyg/widgets/link.js

@@ -48,6 +48,9 @@ export class Link extends Component {
     ];
     setup() {
         this.state = useState({});
+        // We need to wait for the `onMounted` changes to be done before
+        // accessing `this.$el`.
+        this.mountedPromise = new Promise(resolve => this.mountedResolve = resolve);
 
         onWillStart(() => this._updateState(this.props));
         let started = false;
@@ -82,8 +85,10 @@ export class Link extends Component {
             this.$el.find('[name="url"]').on('change', this._onURLInputChange.bind(this));
 
             await this.start();
+            this.mountedResolve();
         });
-        onWillUpdateProps((newProps) => {
+        onWillUpdateProps(async (newProps) => {
+            await this.mountedPromise;
             this._updateState(newProps);
             this.state.url = newProps.link.getAttribute('href') || '';
             this._setUrl({ shouldFocus: newProps.shouldFocusUrl });
@@ -182,7 +187,7 @@ export class Link extends Component {
      * Focuses the url input.
      */
     focusUrl() {
-        const urlInput = this.linkComponentWrapperRef.el.querySelector('input[name="url"]');
+        const urlInput = this.$el[0].querySelector('input[name="url"]');
         urlInput.focus();
         urlInput.select();
     }

addons/web_editor/static/src/js/wysiwyg/widgets/link_tools.js

@@ -52,7 +52,8 @@ export class LinkTools extends Link {
 
     setup() {
         super.setup(...arguments);
-        onWillUpdateProps((newProps) => {
+        onWillUpdateProps(async (newProps) => {
+            await this.mountedPromise;
             this.$link = newProps.link ? $(newProps.link) : this.link;
             this._setSelectOptionFromLink();
             this._updateOptionsUI();