bug#24828: 26.0.50; Renaming of display-buffer-in-major-side-window broke which-key.el

[Óscar Fuentes]

which-key.el was "fixed" with the following commit message:

 Remove use of display-buffer-in-major-side-window

 According to emacs bug #24828, this is an internal function and should
 not be used. Following the advice from that report, switch to
 display-buffer-in-side-window and add an option for the user to specify
 the slot value for that function.

Closing this bug. Let's hope that there are no more packages out there
that use this function(s).