keymap text property bindings not reported

[Ilya N. Golubev]

Version: 21.4

Ran `C-j' in lisp interaction mode buffer to obtain abbreviated lisp
value printouts.  These abbreviated printouts have text properties
allowing to switch to full display, and trying to document this.  In
particular, they have `keymap' text property that binds `RET' key.

Moved point in text with such properties, ran `describe-key' and
`describe-bindings'.  Their outputs disagree.  `describe-key' appears
to be correct: it says that <RET runs the command
last-sexp-toggle-display>.  `describe-bindings' is certainly wrong by
showing the binding:

RET             newline