[devhelp] Book: do not provide completion for book titles

[Sébastien Wilmet <swilmet src gnome org>]

commit a4c82b8a71f8a30e09ee223396f8cf9f1c123590
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Jan 20 10:11:58 2018 +0100

    Book: do not provide completion for book titles

 src/dh-book.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/dh-book.c b/src/dh-book.c
index e351da2..864f887 100644
--- a/src/dh-book.c
+++ b/src/dh-book.c
@@ -526,6 +526,13 @@ dh_book_get_completion (DhBook *book)
                         DhLink *link = l->data;
                         const gchar *str;
 
+                        /* Do not provide completion for book titles. Normally
+                         * the user doesn't need it, it's more convenient to
+                         * choose a book with the DhBookTree.
+                         */
+                        if (dh_link_get_link_type (link) == DH_LINK_TYPE_BOOK)
+                                continue;
+
                         str = dh_link_get_name (link);
                         dh_completion_add_string (priv->completion, str);
                 }