Re: Updating *Completions* as you type

[Juri Linkov]

>> 1. display-buffer-overriding-action
>> 2. display-buffer-alist
>> 3. function call arguments that correspond to completion metadata
>> 4. display-buffer-base-action
>> 5. display-buffer-fallback-action

> Sharing this insight in the associated documentation will aid users.

This is thoroughly documented in (info "(elisp) Choosing Window"):

     ‘display-buffer’ builds a list of action functions and an action
     alist, by consolidating display actions from the following sources
     (in order of their precedence, from highest to lowest):

        • The variable ‘display-buffer-overriding-action’.
        • The user option ‘display-buffer-alist’.
        • The ACTION argument.
        • The user option ‘display-buffer-base-action’.
        • The constant ‘display-buffer-fallback-action’.