Document pickers don't keep the full width anymore after selecting a document in some macros

Steps to reproduce

1. Edit a page with CKEditor
2. Insert Page Tree macro or Children macro from CKEditor toolbar or from Quick Actions
3. Under "Optional parameters" tab (first tab) (on Page Tree macro), select a page with a shorter name on 'Root' and 'Open to' sections (e.g. Sandbox or Menu)
4. Click somewhere else in order to close the picker
5. Observe the width of the pickers

Expected results

Even if a document with a shorter name is selected, the pickers keep their full width of the macro modal.

Actual results

The pickers shrink to the left side after closing, losing the consistency with the other input fields.

The issue could be reproduced on XWiki 18.2.1 as well, but could not be reproduced on XWiki 18.0.0.