Commit Briefs
de-quirkify execute-extended-command
On RET, execute the command on the selected line rather than what the user typed. This saves a TAB (to expand the entry) and is more in line with the other completion commands.
reorder minibuffer stuff
and while there also rename the bogus completing_read to minibuffer_read. To get a ``completing-read'' one has to call enter_minibuffer with the right parameters.