xfce4-session: Configure scaling factor for Qt programs in `startxfce…

…4_hidpi`

Starting RStudio on a HiDPI monitor, it is currently displayed too small
by default.

Follow the [Arch Linux Wiki][1] to fix the problem.

> Since Qt 5.6, Qt 5 applications can be instructed to honor screen DPI by
> setting the QT_AUTO_SCREEN_SCALE_FACTOR environment variable:
>
>     export QT_AUTO_SCREEN_SCALE_FACTOR=1

Note, this has no effect on mx2017 systems with Qt 5.4.

Increment the revision number.

Tested with R 1.1.383 on *keineahnung*.

[1]: https://wiki.archlinux.org/index.php/HiDPI#Qt_5

xfce4-session.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION xfce4-session-4.12.1-2
+# BEE_VERSION xfce4-session-4.12.1-3
 
 ## 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.)
@@ -59,11 +59,12 @@ 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
+    # https://wiki.archlinux.org/index.php/HiDPI
     start_cmd cat >${D}${BINDIR}/startxfce4_hidpi <<-EOF
 	#!/bin/bash
 	export GDK_SCALE=2
 	export GDK_DPI_SCALE=-1
+	export QT_AUTO_SCREEN_SCALE_FACTOR=1
 	export XCURSOR_SIZE=48
 	/usr/bin/startxfce4 "$@"
 EOF