Re: Feature request : Tab-completion for 'shell-comand'

[martin rudalics]

>>They're a pain because `remove-overlays' does (1) recenter all overlays,
>>(2) construct a list of all overlays in the region, (3) select the
>>overlays needed, and (4) delete them.  All this for the single purpose
>>that overlays overlapping BEG or END get split appropriately.
>
>
> You mean it's not as efficient as it could be?  Agreed.
> It hasn't bit me yet, tho.  Do you have a use case where the speed is
> a problem?

Removing the old whitespace overlays was devastatingly slow.  Richard
fixed it by putting an (overlay-recenter (point-max)) somewhere in the
code of whitespace.el before the call of `remove-overlays'.  But I still
don't understand why that fixed the problem and, for example, why the
argument `point-max' is any better than say `point-min'.  And the nxml
author wants to

** Explore whether overlay-recenter can cure overlays performance
problems.

Is there really anyone using `remove-overlays' who also wants its
feature that "Overlays might be moved and/or split."