Re: When is hourglass shown?

[Jan D.]

Stefan Monnier wrote:

> > > Can someone please tell me when an hourglass is shown on X Emacs? Is it
> > > shown for an operation like ediff-buffers (that takes a long time on my pc)?
> > > Is it shown for indent-region?
> > >      
>
>  
>
> > Not for indent-region (it should be IMHO).
> >    
>
> Are you sure?  I thought it was command-agnostic (i.e. it simply displays
> an hourglass if more than X seconds have passed since Emacs was last ready
> to process keyboard input).
>
> [ ... trying out (setq indent-line-function (lambda () (while t))) ... ]
>
> Duh! You're right.  Hmm... how does this thing work?

I only tried M-x indent-region.  For that no hourglass is shown.  But if 
invoked with M-C-\ an hourglass is shown.  Turns out that M-x ... calls 
minibuffer-complete-and-exit, and that function throws so the start 
hourglass action is unwind and canceled.  A bit inconsistent here.

   Jan D.