[PATCH xorg] Relation between the -seat parameter and ServerLayout

[Олег Самарин]

GDM 3 starts Xorg without specifying -layout parameter, but only with
-seat.

In multiseat enviroment it should be preferable to have several
ServerLayout sections with some configuration options, one ServerLayout
per seat.

This patch (for xorg 1.12.3) allows to link a ServerLayout to a certain
seat by specifying "Seat" option.

Here is an example: ServerLayout sections of my xorg.conf

----------------------------------------------------------
Section "ServerLayout"
	Identifier     "Seat0"
	Screen      0  "ScreenBelinea" 0 0
	Option	"SingleCard"	"true"
	Option	"Seat"	"seat0"
EndSection

Section "ServerLayout"
	Identifier     "Seat1"
	Screen      0  "ScreenDell" 0 0
#	Screen      1  "ScreenMarantz" 0 0
	Option	"SingleCard"	"true"
	Option	"Seat"	"seat1"
EndSection

---------------------------------------------------------

gdm launches two Xorg instances:

Xorg -seat seat0
Xorg -seat seat1

With this patch each Xorg instance uses its own "ServerLayout" section
and everything works.

More info at http://bugzilla.redhat.com/show_bug.cgi?id=878605

I'd like the patch to be released upstream




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