bug#51094: Check if run-with{-idle, }-timer needs to create a timer

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Yes, the semantics of running things from a timer are different from
> running them in the normal flow, so we can't transform 0-delay timers
> into funcalls.

See for instance:

  (when (> (minibuffer-depth) 0)
    ;; We're inside a minibuffer already, so if the emacs-client is trying
    ;; to open a frame on a new display, we might end up with an unusable
    ;; frame because input from that display will be blocked (until exiting
    ;; the minibuffer).  Better exit this minibuffer right away.
    (run-with-timer 0 nil (lambda () (server-execute-continuation proc)))

So this change is a no go.

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