Module selectable 

Text you can select with the pointer and copy out of.

The two hard halves are already here: render_with paints a Selection it is handed, and fills a BlockLayouts whose BlockLayouts::hit turns a point back into a Cursor. What was missing is the gesture — press, drag, release — which belonged to whoever owns the selection, and until now only an editor ever did.

This is that gesture and nothing else. Which item holds the selection, and what copying means, stay the caller’s.

Enums

Pointer

What the pointer did over the text.

Functions

copied

The text a selection covers, as it would be pasted.

render

Render doc with selection painted in it, reporting what the pointer does.