[glom] Add a comment.

[Murray Cumming <murrayc src gnome org>]

commit 0211acca779b3b15f14d0e1f71fee1d41ff819bf
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Mar 9 08:40:19 2015 +0100

    Add a comment.

 glom/mode_data/datawidget/datawidget.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/glom/mode_data/datawidget/datawidget.h b/glom/mode_data/datawidget/datawidget.h
index fe99102..f36bf8d 100644
--- a/glom/mode_data/datawidget/datawidget.h
+++ b/glom/mode_data/datawidget/datawidget.h
@@ -119,7 +119,9 @@ private:
 
   virtual AppWindow* get_appwindow() const;
 
+  /// Set the minimum widget size, depending on the type of fields.
   void set_child_size_by_field(const sharedptr<const LayoutItem_Field>& field);
+
   int get_suitable_width(const sharedptr<const LayoutItem_Field>& field_layout);
 
   /** Show a dialog with a Find so that the user can choose an ID value to indicate the related record.