Don't use orderless with company-capf as a default about spacemacs HOT 4 OPEN

Sounds reasonable I'll put it in my queue

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I am going to remove undo-tree due to a lot of other issues anyway so no need to bother with the message.

Once it is removed though I would be happy about some feedback though.

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Merged your PR @fnussbaum

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The problem I have is that when I try to use auto-completion in an emacs-lisp buffer the auto-completion gets unuseably slow

I encountered the same problem, but it was not due to orderless, as it persisted with only the basic completion style enabled on my system. I looked into it, and it was mainly due to undo-tree polluting obarray with hundreds of thousands garbage symbols undo-tree-id.... The following function counted more than a million for me:

(defun fn/count-undo-tree-ids ()
  (interactive)
  (let ((count 0))
    (cl-do-all-symbols (sym)
      (when (string-prefix-p "undo-tree-id" (symbol-name sym))
        ;; (unintern sym) ; this fixes the slowness for me
        (cl-incf count)))
    (message "Counted %s undo-tree-id symbols in obarray." count)))

Those symbols were initially created to deal with markers and should have stayed uninterned, but they get interned implicitly during deserialisation. In particular they do not serve any purpose after deserialisation, as undo-tree-deserialize initialises the object-pool to an empty hash table, and markers do not survive having their buffer killed anyway.

The completion using company still felt a little bit slow, hence I switched to corfu for emacs-lisp-mode which unlike company does not seem to slow down typing at all, and one can easily use orderless with a SPC separator.

Sounds reasonable I'll put it in my queue

I think the existing advice is fine, at least on my system disabling orderless does not seem to have any benefits.

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