xfce4-session: Add wrapper for scaling on HiDPI displays

On HiDPI displays, UI elements and text should be scaled up, so that
they are big enough to be readable. Add a wrapper for startxfce4 setting
the appropriate variables, so that GTK+ applications are scaled up.

Increment the revision.

xfce4-session.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION xfce4-session-4.12.1-0
+# BEE_VERSION xfce4-session-4.12.1-1
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)
@@ -58,6 +58,15 @@ SRCURL[0]="http://archive.xfce.org/src/xfce/xfce4-session/${PKGVERSION[2]}/xfce4
 
 mee_install_post() {
     start_cmd mv ${D}${DATADIR}/xsessions{,.available}
+
+    # https://wiki.archlinux.org/index.php/HiDPI#GDK_3_.28GTK.2B_3.29
+    start_cmd cat >${D}${BINDIR}/startxfce4_hidpi <<-EOF
+	#!/bin/bash
+	export GDK_SCALE=2
+	export GDK_DPI_SCALE=-1
+	export XCURSOR_SIZE=48
+	/usr/bin/startxfce4 "$@"
+EOF
 }