* lisp/epa.el (epa-show-key): New command.

* lisp/epa.el (epa-show-key): New command.

Users can move in `epa-key-list-mode' buffers using either
`next-line'/`previous-line' or `widget-forward'/`widget-backward'.
When using the first set of commands, then the cursor stays in the
current column and that normally is the first column.  The key
widgets do not begin until the third character of their respective
lines.

All `epa' commands work regardless of whether the cursor is on the
widget or before them.  The `epa-show-key' command did not exist until
now because the `widget-button-press' already performs its task.  But
because the widgets don't span complete lines we actually need this
command too.