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bug#9366: Display geometry change hook

From: David De La Harpe Golden
Subject: bug#9366: Display geometry change hook
Date: Thu, 25 Aug 2011 06:16:58 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110626 Icedove/3.1.11

Severity: wishlist

Raised by Edward O'Connor in emacs-devel thread [1], filing in bugtracker so it doesn't get lost over the feature freeze period.

Emacs doesn't appear to currently provide a hook that is reliably called when the _display_ geometry changes on graphical window systems. e.g. screen resolution changed by user, monitor hotplugging.

Emacs frame/window geometry might sometimes be considered to remain the same by the window system terms despite changing overall display geometry, so e.g. window-configuration-change-hook is not always run when the display geometry changes.

Attached is an initial x11-only stab at an implementation that calls window-configuration-change-hook when display geometry changes, though a separate hook would be another design option.

For ns, Edward also mentioned:

"On GNUStep and Mac OS X, applications can listen for NSApplicationDidChangeScreenParametersNotification for this sort of thing"

Dunno about w32 as yet, but presumably it has something similar.

[1] http://lists.gnu.org/archive/html/emacs-devel/2011-08/msg00544.html
From: "Edward O'Connor" <...>
Date: Fri, 12 Aug 2011 10:51:25 -0700
Message-ID: <address@hidden>
Subject: is there a hook run when display geometry changes?

Attachment: xrandr_monitoring_r1.diff
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