Set IntelliJ HIDPI flag according to scaling-factor

idea.sh

--- bin/idea.sh	2015-06-02 00:03:02.869607320 -0300
+++ bin/idea.sh	2015-06-02 00:01:59.867708731 -0300
@@ -171,6 +171,12 @@
   CLASSPATH="$CLASSPATH:$IDEA_CLASSPATH"
 fi
 
+# Define HIDPI flag
+SCALE_FACTOR=$(gsettings get org.gnome.desktop.interface scaling-factor | sed 's/uint32\ //')
+if [ "$SCALE_FACTOR" = 2 ]; then
+    HIDPI_PROPERTIES="-Dhidpi=true"
+fi
+
 # ---------------------------------------------------------------------
 # Run the IDE.
 # ---------------------------------------------------------------------
@@ -181,6 +187,7 @@
   $VM_OPTIONS "-Djb.vmOptionsFile=$VM_OPTIONS_FILES_USED" \
   "-XX:ErrorFile=$HOME/java_error_in_IDEA_%p.log" \
   -Djb.restart.code=88 -Didea.paths.selector=IntelliJIdea14 \
+  $HIDPI_PROPERTIES \
   $IDE_PROPERTIES_PROPERTY \
   $IDE_JVM_ARGS \
   $REQUIRED_JVM_ARGS \