Use the current screen width when determining where to display the yad window.

Author: jlesage

Dockerfile

@@ -119,7 +119,8 @@ RUN \
         bash \
         coreutils \
         findutils \
-        expect
+        expect \
+        xdpyinfo
 
 #        && \
 #    # Save some space by removing unused DRI drivers.

rootfs/etc/services.d/autovideoconverter/run

@@ -91,7 +91,7 @@ log_hb_encode_progress_yad() {
     ) | /opt/base/bin/yad \
             --fixed \
             --width=384 \
-            --posx=$(expr $DISPLAY_WIDTH / 2 - 384 / 2) \
+            --posx=$(expr $(xdpyinfo | awk -F'[ x]+' '/dimensions:/{print $3}') / 2 - 384 / 2) \
             --posy=5 \
             --title "Automatic Video Converter" \
             --window-icon /opt/novnc/images/icons/master_icon.png \