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bug#24372: 25.1.50; After losing focus, cursor is hidden when moving poi

From: Philipp Stephani
Subject: bug#24372: 25.1.50; After losing focus, cursor is hidden when moving point
Date: Fri, 09 Sep 2016 16:20:19 +0000

Eli Zaretskii <address@hidden> schrieb am Fr., 9. Sep. 2016 um 18:07 Uhr:
> From: Philipp Stephani <address@hidden>
> Date: Fri, 09 Sep 2016 15:59:02 +0000
> Cc: address@hidden
> Eli Zaretskii <address@hidden> schrieb am Di., 6. Sep. 2016 um 18:03 Uhr:
>  > From: Philipp Stephani <address@hidden>
>  > Date: Mon, 05 Sep 2016 21:16:40 +0200
>  >
>  > emacs -Q -eval '(setq blink-cursor-delay 0.0)'
>  >
>  > Move point around in the scratch buffer (e.g. press C-b a couple of
>  > times): the cursor stays visible, as it should be. Then put the mouse
>  > focus on a different GTK window (not Emacs window), put the mouse focus
>  > back on Emacs, and move point again: the cursor is hidden, making it
>  > impossible to see until you stop moving.
>  Does it happen even if you wait with cursor motion until after the
>  cursor blinks one time, i.e. if you start moving point with the cursor
>  already visible after Emacs gets focus?
> Yes. No matter what state the cursor is in and how often it has already blinked, it becomes invisible when
> moving.

So what is the importance of moving focus out of the Emacs frame and
then back into it?  Is the problem reproducible without that?  Or are
you saying that focus-out followed by focus-in event somehow changes
the behavior wrt displaying the cursor?

Yes. The cursor only become invisible after a focus-out/focus-in event.
This isn't surprising given that blink-cursor-mode changes focus-in-hook and focus-out-hook. Probably the bug is hidden somewhere in the complex interaction between the various blink-cursor timers and hooks. 

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