jQuery was used extensively in `convert_inline`, slowing it down by a factor of more than 2. This replaces all use of jQuery with vanilla javascript so as to improve performance significantly. X-original-commit: 8573a4ebbfe951c9ce0d3ef753174f4f0a6c829b Part-of: odoo/odoo#84513 Co-authored-by: Antoine Guenet <age@odoo.com> Co-authored-by: Nicolas Bayet <nby@odoo.com>