This contextual action opens a modifiable, movable components list.
Insertion Points (Nodes)
- In a popover menu, clicking the node icon (a plus sign) changes it into a close icon. Clicking again changes it back and closes the menu.
- Alslds-p-bottom_nonel menu options should map to available components in the left-hand component panel.
- When content is added to an empty canvas, add a node for click to create below each new row.
- Clicking to add a component selects that component and shows its property sheet (just as when dropping a component onto the canvas).