bug#27427: 26.0.50; Native line numbers lead to display error in company-mode popup

[martin rudalics]

> We need post-command-hook anyway, to add or remove the timer depending
> on the last command. I don't recall the exact reasons for the choice
> between the idle and non-idle timers, but flyspell comes to mind (and
> its use of sit-for).

It would be interesting to know these reasons to avoid reinventing that
choice elsewhere.

> Maybe that's enough. What if the user moves the Emacs frame around
> with a mouse, without resizing? Will the tooltip window follow?

A child frame automatically moves along with its parent.  Normal frames
must be moved manually.  ‘move-frame-functions’ is the hook provided to
do that.

martin