execute-extended-command could prompt with command under cursor as default

[Dan Jacobson]

looking at this *Help*:
------------
ESC x runs the command execute-extended-command
   which is an interactive built-in function.

Read function name, then read its arguments and call it.

(execute-extended-command PREFIXARG)
-----------
OK, but you didn't mention what happens with PREFIXARG, but by the
way, and mainly: how about say I've just done an (apropos "color" nil)
and my cursor is resting on the line "list-colors-display" and I typed
M-x.  Wouldn't it be convenient if I was prompted with
"list-colors-display" as being the thing that will be run if I just
hit return at this point, instead of having to type in
"list-colors-display" at this point?
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