[FIX] web_editor: re-implement focus method

Focus is sometimes called on the Wysiwyg class in Note.
When the user use TAB to select the next field.

Implementation was missing.

closes odoo/odoo#69033

X-original-commit: 720c1f38a17ef54cf30e0a52bab5bceed70c2144
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

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

@@ -395,6 +395,25 @@ const Wysiwyg = Widget.extend({
     redo: function () {
         this.odooEditor.historyRedo();
     },
+    /**
+     * Focus inside the editor.
+     *
+     * Set cursor to the editor latest position before blur or to the last editable node, ready to type.
+     */
+    focus: function () {
+        if(!this.odooEditor.resetCursorOnLastHistoryCursor()) {
+            // If the editor don't have an history step to focus to,
+            // We place the cursor after the end of the editor exiting content.
+            const range = document.createRange();
+            const elementToTarget = this.$editable[0].lastElementChild ? this.$editable[0].lastElementChild : this.$editable[0];
+            range.selectNodeContents(elementToTarget);
+            range.collapse();
+
+            const selection = this.odooEditor.document.getSelection();
+            selection.removeAllRanges();
+            selection.addRange(range);
+        }
+    },
     /**
      * Start or resume the Odoo field changes muation observers.
      *