Initial implementation of 'sticky_behavior' configuration, based on MR 118. (!123) · Merge requests · project / admin_toolbar

Initial implementation of sticky_behavior configuration, based on the work from MR !118 (closed) by @darkdim and @ressa.

Merged in previous configuration (boolean) disable_sticky into (string) sticky_behavior, with 3 options:
enabled (default), disabled, hide_on_scroll_down.
Moved all JS/CSS logic to a new library with specific files with Vanilla JS behaviors, to prevent from modifying any of the existing JS or CSS code or introducing new ESLint errors, see MR !116.
Updated the Admin Toolbar Settings form field labels, descriptions, etc...

Initial implementation of 'sticky_behavior' configuration, based on MR 118.