On Tue, Jul 11, 2017 at 10:31 AM Eli Zaretskii <address@hidden
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.