eldoc-overlay

Eldoc displays the function signature of the closest function call
around point either in the minibuffer or in the modeline.

This package modifies Eldoc to display this documentation inline
using a buffer text overlay.

 `eldoc-overlay-mode' is a per-buffer local minor mode.

By default, the overlay is not used in the minibuffer, eldoc is shown in the modeline
in this case.  Set the option `eldoc-overlay-enable-in-minibuffer' non-nil if you want
to enable overlay use in the minibuffer.

Finally, see the documentation for `eldoc-overlay-backend' if you want to try
a different overlay display package backend.