diff -r 0f44d6dbd2a4 -r 042d6e58cb40 src/Tools/jEdit/src/info_dockable.scala
--- a/src/Tools/jEdit/src/info_dockable.scala	Wed May 21 15:24:42 2014 +0200
+++ b/src/Tools/jEdit/src/info_dockable.scala	Wed May 21 16:21:11 2014 +0200
@@ -50,8 +50,6 @@
 {
   /* component state -- owned by Swing thread */
 
-  private var zoom_factor = 100
-
   private val snapshot = Info_Dockable.implicit_snapshot
   private val results = Info_Dockable.implicit_results
   private val info = Info_Dockable.implicit_info
@@ -70,12 +68,14 @@
 
   pretty_text_area.update(snapshot, results, info)
 
+  private val zoom = new Font_Info.Zoom_Box { def changed = handle_resize() }
+
   private def handle_resize()
   {
     Swing_Thread.require {}
 
     pretty_text_area.resize(
-      Font_Info.main(PIDE.options.real("jedit_font_scale") * zoom_factor / 100))
+      Font_Info.main(PIDE.options.real("jedit_font_scale") * zoom.factor / 100))
   }
 
 
@@ -88,9 +88,6 @@
     override def componentResized(e: ComponentEvent) { delay_resize.invoke() }
   })
 
-  private val zoom = new GUI.Zoom_Box(factor => { zoom_factor = factor; handle_resize() })
-  zoom.tooltip = "Zoom factor for basic font size"
-
   private val controls = new Wrap_Panel(Wrap_Panel.Alignment.Right)(
     pretty_text_area.search_label, pretty_text_area.search_field, zoom)
   add(controls.peer, BorderLayout.NORTH)