Tidy up the user interface for depth of field based on feedback by

NudelZ on irc, thanks!

release/scripts/startup/bl_ui/properties_data_camera.py

@@ -184,15 +184,15 @@ class DATA_PT_camera_dof(CameraButtonsPanel, Panel):
         col = split.column()
         col.label(text="Focus:")
         col.prop(cam, "dof_object", text="")
-        col.prop(dof_options, "use_high_quality")
-
-        col = split.column()
-        col.prop(dof_options, "fstop")
-
         sub = col.column()
         sub.active = (cam.dof_object is None)
         sub.prop(cam, "dof_distance", text="Distance")
 
+        col = split.column(align=True)
+        col.label("Viewport:")
+        col.prop(dof_options, "use_high_quality")
+        col.prop(dof_options, "fstop")
+
         if dof_options.use_high_quality:
             col.prop(dof_options, "blades")