xsettingsd: use first screen DPI as DPI for the session

bin/xsettingsd-setup

@@ -2,7 +2,8 @@
 
 DISPLAY=${DISPLAY%.0}
 
-# For information
+# Compute DPI of each screens
+dpis=""
 for info in $(xrandr --current \
                   | sed -n 's/^\([^ ]\{1,\}\)* connected.* \([0-9]\{1,\}\)x.* \([0-9]\{1,\}\)mm x .*/\1,\2,\3/p'); do
     output=${info%%,*}
@@ -19,17 +20,13 @@ for info in $(xrandr --current \
     rounded=$(((corrected + 24) / 48 * 48))
     [ $rounded -gt 192 ] && rounded=$(((corrected + 48) / 96 * 96))
     [ $rounded -lt 96 ] && rounded=96
+    dpis="$dpis$rounded "
     echo "$output: ${dpi}dpi (corrected to ${corrected}dpi, rounded to ${rounded}dpi)" >&2
 done
 
-# Don't try to guess DPI. For a laptop, we don't want the same DPI as
-# for an external screen or for a TV. Just hardcode stuff...
-case $(hostname),$(autorandr --current) in
-    zoro,default)       dpi=144 ;;
-    guybrush,default)   dpi=144 ;;
-    neo,*)              dpi=192 ;;
-    *,*)                dpi=96 ;;
-esac
+# Use first screen DPI
+dpi=${dpis## *}
+dpi=${dpi:-96}
 
 echo "using ${dpi}dpi" >&2
 xrandr --dpi $dpi