ui/gtk3: Get PangoAttrList of auxiliary text from IBusText

Since IBus auxiliary text would be one line, it's better to show the
character attributes likes color, italic, bold, on the auxiliary text.

Also deleted the cursor width from the X position of CandidatePanel
because IBus preedit overrides the original cursor of the applications.

ui/gtk3/candidatepanel.vala

@@ -3,7 +3,7 @@
  * ibus - The Input Bus
  *
  * Copyright(c) 2011-2015 Peng Huang <[email protected]>
- * Copyright(c) 2015-2017 Takao Fujiwara <[email protected]>
+ * Copyright(c) 2015-2018 Takao Fujiwara <[email protected]>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -153,6 +153,8 @@ public class CandidatePanel : Gtk.Box{
     public void set_auxiliary_text(IBus.Text? text) {
         if (text != null) {
             m_aux_label.set_text(text.get_text());
+            Pango.AttrList attrs = get_pango_attr_list_from_ibus_text(text);
+            m_aux_label.set_attributes(attrs);
             m_aux_label.show();
         } else {
             m_aux_label.set_text("");
@@ -314,7 +316,7 @@ public class CandidatePanel : Gtk.Box{
 
     private void adjust_window_position_horizontal() {
         Gdk.Point cursor_right_bottom = {
-                m_cursor_location.x + m_cursor_location.width,
+                m_cursor_location.x,
                 m_cursor_location.y + m_cursor_location.height
         };