Slice 3: Add a “Rich Text” Document Builder Element

[mnholtz]

Implementation sketch

See https://www.notion.so/pixiebrix/Phase-1-Implement-Rich-Text-Editor-f74aea6b845847c0ad25f81d8236da3c?pvs=4#12843b21a25380c4bda7e2220d1f2af2

Acceptance Criteria

Ability to Add Rich Text Document Builder Element

• Given a Document Renderer brick being edited via the Document Builder
• When a user clicks on the add element three-dot menu
• Then the list of available elements should contain a “Rich Text”

Editing Rich Text Document Builder Element

• Given a rich text element is selected in the Document Builder
• When the user views the element configuration pane
• Then the available fields should contain the following fields
  • Rich text
  • Hidden

Rendering Rich-Text Field Output

• Given a mod with a form that contains a “Rich Text Editor” field whose output is rendered in a renderer brick (e.g. a Document Renderer)
• When the mod is run
• Then the rendered HTML should adhere to the default and custom stylesheets applied to the Document Renderer