I'd like text to wrap in a Rectangle, but there seems to be a default gap of 1
pixel to the edge, which looks too tight at high zoom, and is actually touching
at lower zoom.

I get a completely different result if I create a Text box and then apply the
Default style; the Text automatically wraps with a fixed border, and it disables
both Adjust to contour and "Spacing to borders".

From the user's perspective, both Rectangle and Text can yield a similar result
depending on styles, so it's confusing and inflexible that they behave so
differently and with different limitations.

I suggest that the most flexible way to represent both Text and Rectangle would
be as a Text component within a Rectangle, where the Text component may always
be indented using "Spacing to borders".

(hopefully this has no impact on the document format; naturally that would make
require a clever extension to ensure that existing documents render the same as
today)