Re: select-frame-set-input-focus fails to raise the frame

[Robert Weiner]

On Wed, Dec 13, 2017 at 5:26 PM, Alan Third <address@hidden> wrote:

FWIW, changing sit-for to sleep-for in ‘test’ results in 4 seconds of
a blank frame, but otherwise behaves as expected. This seems to work,
though:

    (defun test ()
      (let ((depress-frame (selected-frame))
            (release-frame (make-frame)))
        (select-frame-set-input-focus depress-frame)
        (sit-for 0)
        (sit-for 4)
        (select-frame-set-input-focus release-frame)))

    (test)

Presumably the first sit-for clears any pending input which then means
the second sit-for can actually do its thing.

(I think this is a side‐effect of the way input works on the NS port
where various things that you might not think of as ‘input’ are
essentially indistinguishable from keyboard input.)

​Great explanations.  The combination of (sit-for 0) to cause

redisplay followed by a (sleep-for <n>) solved the problem

completely​ for me.  As you noted, sit-for can return prematurely

and seems to in the context in which I am using it, whereas

sleep-for waits the given seconds as desired.

This seems to indicate there is a need to simplify the process for

temporarily showing a frame at the top of the stack.  The use case

I have right now is putting a particular buffer into a newly created

frame but having the previously selected frame remain the topmost

frame with input focus after the operation completes.  To show that

the buffer has been put into the frame, I want to show it temporarily

and then move it beneath the original top frame.

Bob

​