Introduce eldoc support in minibuffer

[Thierry Volpiatto]

Hi,
when editing code in minibuffer (M-:) eldoc is not available.
This patch provide this feature.
eldoc is displayed in mode-line.
It provide a macro that can be put around any code that use minibuffer
like this:

(with-eldoc-in-minibuffer (read-string "test: "))

It take care of other minibuffers and display eldoc only in the ones
called with `with-eldoc-in-minibuffer'.

Of course you can disable this feature with `eldoc-in-minibuffer' set to
nil.


-- 
A+ Thierry
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patch-eldoc-in-minibuffer.patch
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