setting primary in multihead xorg.conf causes disregard of DisplaySize

[Felix Miata]

Using the following, I get the display positions the way I want them, but
the DPI I want is disregarded. If I comment the primary option line, DPI
is obeyed, but the wrong display is primary. Am I doing something wrong,
missing something, is a ServerLayout section required, or is there a bug
here?

# 50-device.conf
Section "Device"
	Identifier	"IGMA"
	Driver	"intel"
	Option	"monitor-VGA1"	"analog"	# Intel analog
	Option	"monitor-HDMI1"	"digital"	# Intel HDMI aka DVI
#	Option	"monitor-DP1"	"apple"		# Intel DisplayPort
EndSection

# 50-monitor1.conf
Section "Monitor"
	Identifier	"analog"
	Option		"Primary"	"true"
	Option		"PreferredMode"	"1680x1050"
	DisplaySize	761 228 # 120 DPI @ 3600x1080
EndSection

# 50-monitor2.conf
Section "Monitor"
	Identifier	"digital"
	Option		"PreferredMode"	"1920x1080"
	Option		"RightOf"	"analog"
EndSection

# 50-screen1.conf
Section "Screen"
	Identifier	"ScreenLeft"
	Device		"IGMA"
	Monitor		"analog"
EndSection

# 50-screen2.conf
Section "Screen"
	Identifier	"ScreenRight"
	Device		"IGMA"
	Monitor		"digital"
EndSection

TIA
-- 
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Felix Miata  ***  http://fm.no-ip.com/