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bug#27647: 26.0.50; Line numbers implemented natively disappear momentar

From: Kaushal Modi
Subject: bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus
Date: Tue, 11 Jul 2017 14:38:39 +0000

On Tue, Jul 11, 2017 at 10:31 AM Eli Zaretskii <address@hidden> wrote:
In that case, I suspect that some of your customizations somehow
temporarily reset display-line-numbers to nil.  You could try to use
Lisp watchpoints (see "Watching Variables" in the ELisp manual) for a
single buffer where this happens, to find out which code does that.

Alternatively, instrument your functions that reset
display-line-numbers to log messages to some buffer with useful
information, such as the Lisp backtrace, and when the problem happens,
examine the log for clues.

I will set up the Lisp watchpoints and debug more, thanks.

I have one more data point. Apparently I do not need to "click" on the emacs frame to make the line numbers reappear. They reappeared seemingly randomly or just as I was just hovering the mouse over the emacs frame.. odd.  This happened just as I was preparing to record "line num reappearance on click" effect, but the line numbers reappeared by themselves even before I clicked. 

Kaushal Modi

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