bug#37628: Inconsistent display of help-echo between minibuffer and tooltips

[Clément Pit-Claudel]

Hi all,

This is a follow-up 
https://lists.gnu.org/archive/html/emacs-devel/2019-10/msg00090.html.

Help-echo strings are not displayed consistently by show_help_echo (in 
keyboard.c) and display-local-help (in help-at-pt.el): in tooltips, 
substitute-command-keys is called on the help-echo string before passing it to 
show-help-function, but help-at-pt doesn't perform any substitutions before 
calling the function.

To reproduce, (insert (propertize "test" 'help-echo "\\[forward-char]")), then 
press C-h . (which displays \[forward-char]) or hover over the inserted text 
with your mouse (which displays C-f).

Clément.