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

From: martin rudalics
Subject: bug#27647: 26.0.50; Line numbers implemented natively disappear momentarily when frame out of focus
Date: Tue, 14 Nov 2017 10:52:48 +0100

>> IIUC GTK doesn't need the original frame.
> xg_hide_tooltip needs it, because the GTK tooltip widget is stashed
> away in its output->data.x structure.

Because ‘tooltip-show’ implicitly uses the selected frame to decide
where to show the tooltip and passes it as argument to ‘x-show-tip’.
Nowhere in the documentation of tooltips we mention that dependency.

> Once again, it would be better to have the GTK code completely
> separated, IMO.

Still I think we should first eliminate all tooltip related global
variables.  They are an unnecessary confusion - only think of
last_show_tip_args impicitly also referring to a frame selected at some
earlier time - and restriction - Emacs could easily show several native
tooltips simultaneously, at least one for each display.


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