From Rick Krull:

One can't resize the columns on several "tree views".  The one that I ran into
was "Decode As: Show".  I added "set_resizable" to make it resizable.

https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7706

svn path=/trunk/; revision=44828

ui/gtk/decode_as_dlg.c

@@ -758,6 +758,7 @@ decode_show_cb (GtkWidget *w _U_, gpointer user_data _U_)
                                                       renderer, "text",
                                                       column, NULL);
         gtk_tree_view_column_set_sizing(tc, GTK_TREE_VIEW_COLUMN_AUTOSIZE);
+        gtk_tree_view_column_set_resizable(tc, TRUE);
         gtk_tree_view_append_column(list, tc);
     }