Odoo Release Updates

[FIX] website: prevent traceback when field changed to attachment

[IMP] html_builder, *: show drag preview for iframe snippets

[FIX] *: automaticaly set legacy at_install

[FIX] website: avoid using `t-portal` when editing login page

[IMP] various: improve confirmation modals with meaningful action verbs

[FIX] website: prevent invalid domain paths containing '.' or '..'

[FIX] html_builder, website: prevent removing last list item in form

[FIX] website: wait iframe before open SEO dialog

[IMP] html_builder, website: use Bootstrap shadow class in shadow option

[IMP] website: add controls to edit Bootstrap shadow classes

[FIX] website: prevent URL customization when no editable slug in the URL

[FIX] website: prevent editing input field in the edit mode on firefox

[MOV] core: move Query into odoo.orm

[FIX] website: add fullscreen loader when loading more themes

[FIX] website: use tour helper to switch website

[FIX] website: fix carousel id duplication

[FIX] html_editor, mass_mailing, website: fix background repeat pattern

[FIX] website: use the correct cache key for _get_page_info

[FIX] website: fix the highlight effects in content Preview

[FIX] html_builder, *: set contenteditable attribute on correct elements

[REF] html_editor, website: move ir_ui_view save methods to website

[IMP] website: standardize floating toolbar test

[IMP] html_builder, *: added tooltip to color picker

[FIX] website: limit SVG width in highlighted text to prevent overflow

[FIX] website: config dropdown option clicking not working on Safari

[IMP] website: default to 301 redirect and autogenerate redirect name

[REM] website: remove manual trigger of auto-hide menus

[FIX] website: translate deepest nodes

[REF] mail: make discuss.channel inherit mail.thread (JS)

[IMP] web, mail *: improve states of systray items