[gtk+] ScrolledWindow: add() before remove() in snippet

[Daniel Boles <dboles src gnome org>]

commit b89bf98731e67921c5f4a328807d2d9fda189898
Author: Daniel Boles <dboles src gnome org>
Date:   Sun Jan 7 16:47:24 2018 +0000

    ScrolledWindow: add() before remove() in snippet
    
    We can't remove() a child widget that wasn't already add()ed, of course.

 gtk/gtkscrolledwindow.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 4f9933e..b2f90d0 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -69,12 +69,17 @@
  * If gtk_container_add() has added a #GtkViewport for you, you can remove
  * both your added child widget from the #GtkViewport, and the #GtkViewport
  * from the GtkScrolledWindow, like this:
+ *
  * |[<!-- language="C" -->
  * GtkWidget *scrolled_window = gtk_scrolled_window_new (NULL, NULL);
  * GtkWidget *child_widget = gtk_button_new ();
  *
  * // GtkButton is not a GtkScrollable, so GtkScrolledWindow will automatically
  * // add a GtkViewport.
+ * gtk_container_add (GTK_CONTAINER (scrolled_window),
+ *                    child_widget);
+ *
+ * // Either of these will result in child_widget being unparented:
  * gtk_container_remove (GTK_CONTAINER (scrolled_window),
  *                       child_widget);
  * // or