[balsa] balsa-index: Use a single bit for 'expanded'

[Peter Bloomfield <peterb src gnome org>]

commit 5a77fe593fa18c105948cbf3343e9f390cff576c
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Mon Jan 13 13:06:51 2020 -0500

    balsa-index: Use a single bit for 'expanded'

 src/balsa-index.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/balsa-index.c b/src/balsa-index.c
index d7ca5cbd6..402fd48cd 100644
--- a/src/balsa-index.c
+++ b/src/balsa-index.c
@@ -154,10 +154,13 @@ struct _BalsaIndex {
     BalsaMailboxNode* mailbox_node;
     guint current_msgno;
     guint next_msgno;
+
     gboolean current_message_is_deleted:1;
     gboolean prev_message:1;
     gboolean next_message:1;
     gboolean collapsing:1;
+    gboolean expanded:1;
+
     int    filter_no;
     gchar *filter_string; /* Quick view filter string, if any */
 
@@ -174,8 +177,6 @@ struct _BalsaIndex {
 
     LibBalsaMailboxSearchIter *search_iter;
     BalsaIndexWidthPreference width_preference;
-
-    gboolean expanded;
 };
 
 /* Class type. */