[FIX] web_editor: fix unbreakable rollback upon column number change

When wrapping the contents of a paragraph into a newly created div, the
nodes' ouid (unbreakable id) must be reset in order to prevent a
"unbreakable" rollback.

This commit makes such property reset and fixes errors related to changing
the number of columns of a text snippet.

task-3165895
opw-3137951

closes odoo/odoo#112521

X-original-commit: e33b802b05b41df20e13ebc44bc5b78edae50bb8
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/js/editor/snippets.options.js

@@ -38,6 +38,7 @@ const {SIZES, MEDIAS_BREAKPOINTS} = require('@web/core/ui/ui_service');
 var qweb = core.qweb;
 var _t = core._t;
 const preserveCursor = OdooEditorLib.preserveCursor;
+const descendants = OdooEditorLib.descendants;
 
 /**
  * @param {HTMLElement} el
@@ -4983,6 +4984,9 @@ registry.layout_column = SnippetOptionWidget.extend({
         let $row = this.$('> .row');
         if (!$row.length) {
             const restoreCursor = preserveCursor(this.$target[0].ownerDocument);
+            for (const node of descendants(this.$target[0])) {
+                node.ouid = undefined;
+            }
             $row = this.$target.contents().wrapAll($('<div class="row"><div class="col-lg-12"/></div>')).parent().parent();
             restoreCursor();
         }
@@ -4995,6 +4999,9 @@ registry.layout_column = SnippetOptionWidget.extend({
         await new Promise(resolve => setTimeout(resolve));
         if (nbColumns === 0) {
             const restoreCursor = preserveCursor(this.$target[0].ownerDocument);
+            for (const node of descendants($row[0])) {
+                node.ouid = undefined;
+            }
             $row.contents().unwrap().contents().unwrap();
             restoreCursor();
             this.trigger_up('activate_snippet', {$snippet: this.$target});