[FIX] web_editor: ensure correct set selection

Ensure the selection is never put inside a contenteditable=false
element when correcting the selection due to navigating around ZWS.

Part-of: odoo/odoo#99460

addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js

@@ -3101,7 +3101,7 @@ export class OdooEditor extends EventTarget {
             // Move selection if next character is zero-width space
             if (nextCharacter === '\u200B') {
                 focusOffset += 1;
-                while (focusNode && !focusNode.textContent[focusOffset]) {
+                while (focusNode && !focusNode.textContent[focusOffset] || !closestElement(focusNode).isContentEditable) {
                     focusNode = nextLeaf(focusNode);
                     focusOffset = 0;
                 }