Attach all behaviors after UI controls are added, giving other modules an opportunity to attach behavior to the LP UI

Fire JS events builder:open, builder:close, and builder:save when opening, closing, and saving content using the experimental frontend widget.

Add theme hook for insert component buttons to make it easier for themers to customize interface buttons

Refactor controller adding class functions that make it easier for developers to override specific functionality -- i.e. changing the way component menus are rendered or the way a component form is returned

Gonçalo Mateus authored 2 years ago and Justin Toupin committed 2 years ago

Issue #3276855: Passing null to parameter #1 ($string) of type string to mb_strtolower() is deprecated

Introduces some basic methods for interacting with the frontend builder. Tests block reference field compatibility.

Issue #3281169: Incorrect region is passed when clicking "+" after moving a component from one region to another