[FIX] web_editor: fix moving inner content in carousel slides

Before this commit, when moving inner content inside a carousel slide
(with the 'move' button), the carousel was jumping to the first slide.

Steps to reproduce the bug:

- In website edit mode, drag and drop a Carousel snippet onto the page.
- Move to the second slide.
- Click on the column to activate its overlay.
- Click and hold the "drag and drop" button of the column to start
dragging it.
- Release the mouse button.
- Bug: the carousel jumps to the first slide.

task-3006831

closes odoo/odoo#114067

X-original-commit: a09031d5f68de5d23bd9cab1910c6f9c50ad7cfd
Signed-off-by: Benoit Socias (bso) <bso@odoo.com>

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

@@ -3641,11 +3641,14 @@ var SnippetsMenu = Widget.extend({
      */
     _onSnippetDragAndDropStop: async function (ev) {
         this.snippetEditorDragging = false;
-        const $modal = ev.data.$snippet.closest('.modal');
+        const modalEl = ev.data.$snippet[0].closest('.modal');
+        const carouselItemEl = ev.data.$snippet[0].closest('.carousel-item');
         // If the snippet is in a modal, destroy editors only in that modal.
         // This to prevent the modal from closing because of the cleanForSave
-        // on each editors.
-        await this._destroyEditors($modal.length ? $modal : null);
+        // on each editors. Same thing for 'carousel-item', otherwise all the
+        // editors of the 'carousel' are destroyed and the 'carousel' jumps to
+        // first slide.
+        await this._destroyEditors(carouselItemEl ? $(carouselItemEl) : modalEl ? $(modalEl) : null);
         await this._activateSnippet(ev.data.$snippet);
     },
     /**