Add missing stage packages and copy ibus socket files to enable ibus for GTK3 applications out-of-the-box.

gtk/launcher-specific

@@ -12,8 +12,6 @@ else
 fi
 
 # ibus and fcitx integration
-# with those definitions fcitx works unconfined out of the box, ibus requires
-# user config to be copied though, https://launchpad.net/bugs/1580463
 GTK_IM_MODULE_DIR=$XDG_CACHE_HOME/immodules
 export GTK_IM_MODULE_FILE=$GTK_IM_MODULE_DIR/immodules.cache
 if [ $needs_update = true ]; then
@@ -27,4 +25,10 @@ if [ $needs_update = true ]; then
     $RUNTIME/usr/lib/$ARCH/libgtk2.0-0/gtk-query-immodules-2.0 > $GTK_IM_MODULE_FILE
   fi
 fi
+# create symbolic link to ibus socket path for ibus to look up its socket files
+# (see comments #3 and #6 on https://launchpad.net/bugs/1580463)
+IBUS_CONFIG_PATH=$XDG_CONFIG_HOME/ibus
+mkdir -p $IBUS_CONFIG_PATH
+[ -d $IBUS_CONFIG_PATH/bus ] && rm -rf $IBUS_CONFIG_PATH/bus
+ln -sfn $REALHOME/.config/ibus/bus $IBUS_CONFIG_PATH
 

snapcraft.yaml

@@ -99,6 +99,8 @@ parts:
       - libappindicator3-1
       - locales-all
       - xdg-user-dirs
+      - ibus-gtk3
+      - libibus-1.0-5
   qt4:
     source: .
     source-subdir: qt