> On 25 Jul 2016, at 9:07 pm, JF Mezei <[email protected]> wrote:
> 
> On 2016-07-25 15:13, Michael Jinks wrote:
> 
>> Yes, I forgot that detail: in some cases (not always, I think, though I
>> can't presently verify how often, this is my gut talking, and this is a
>> hard error to make happen on purpose) the vanished windows will still show
>> up in the list.
> 
> Not a direct answer: In my experience, when a computer goes to sleep, a
> remote windows displayed on it remains for some seconds after you wake
> the machine. At that point, the X server realises the connection was
> long ago severed with the X client (since the server was asleep and not
> sending keepalives) and only then does the window disappear.  So in
> cases of sleep, you get to see the window for a while before it
> disappears after a wake.


True, but not really really related to the issue. I see the same (also, 
probably since more or less the update to OSX10.11) but the machine going to 
sleep is not an issue here. It happens for me if I leave a running machine for 
a while, and come back later. I have my machine set to not go to sleep 
automatically, only when I close the lid, which is not happening. I also see if 
for X windows from the local machine, so no remote host is involved.

Chris

> 
> In the case of turning on/off my TV (adds/removes a display) the screens
> will flash once or more and all too often, all of the X windows come to
> the foreground.
> 
> 
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