bug#62029: 29.0.60; Allow users to customize eldoc buffer separator

["João Távora" <joaotavora@gmail.com>]

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Hi Yuan,

Mostly just replying so I'm kept in the loop.

I'm preparing a proposal for and Eldoc enhancements that could link with
this.

For example, i don't think that the eldoc function that displays in the
echo area should piggy-back on the contents of the eldoc doc buffer used by
the other display function. This was a misdesign (by me). Each display
function should be given as much information as possible and then decide
how and where to render without affecting other members of
'eldoc-display-functions'.

I think it's important to decide if things like line separation are
properties of a given member of 'eldoc-display-function' or if eldoc in
general. I strongly lean to the former.

João

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