[FIX] web_editor, web: fix traceback with drag & drop when no header

Commit [1] introduced the bug by relying on the fact an element with
id=top is in the edited DOM. As the website header can be disabled, this
induced a crash as soon as the header was indeed disabled. Also, the
editor is not meant to edit the website only so we cannot rely at all
on the presence of a #top element.

[1]: https://github.com/odoo/odoo/commit/6df67a28c2f113572acd4a3db19ab6b1bd37e7da

closes odoo/odoo#54409

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/addons/web/static/src/js/core/smooth_scroll_on_drag.js b/addons/web/static/src/js/core/smooth_scroll_on_drag.js
index 71ea347ed9d..a53323174cf 100644
--- a/addons/web/static/src/js/core/smooth_scroll_on_drag.js
+++ b/addons/web/static/src/js/core/smooth_scroll_on_drag.js
@@ -21,25 +21,25 @@ const OffsetElementsHelper = Class.extend({
         this.offsetElements = offsetElements;
     },
     top: function () {
-        if (!this.offsetElements.$top) {
+        if (!this.offsetElements.$top || !this.offsetElements.$top.length) {
             return 0;
         }
         return this.offsetElements.$top.get(0).getBoundingClientRect().bottom;
     },
     right: function () {
-        if (!this.offsetElements.$right) {
+        if (!this.offsetElements.$right || !this.offsetElements.$right.length) {
             return 0;
         }
         return this.offsetElements.$right.get(0).getBoundingClientRect().left;
     },
     bottom: function () {
-        if (!this.offsetElements.$bottom) {
+        if (!this.offsetElements.$bottom || !this.offsetElements.$bottom.length) {
             return 0;
         }
         return this.offsetElements.$bottom.get(0).getBoundingClientRect().top;
     },
     left: function () {
-        if (!this.offsetElements.$left) {
+        if (!this.offsetElements.$left || !this.offsetElements.$left.length) {
             return 0;
         }
         return this.offsetElements.$left.get(0).getBoundingClientRect().right;