[balsa/gtk3] Do not crash when part is changed while finding

[Peter Bloomfield <peterb src gnome org>]

commit 29ed1c0390fdfb18a2f3e3ee540d3a0ff706ca00
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Fri Mar 27 18:18:33 2015 -0400

    Do not crash when part is changed while finding
    
        * src/balsa-message.c: do not crash when current part is changed
        while the find-bar is showing.

 ChangeLog           |    5 +++++
 src/balsa-message.c |    4 +---
 2 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index a464c88..c195771 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-03-27  Peter Bloomfield  <pbloomfield bellsouth net>
+
+       * src/balsa-message.c: do not crash when current part is changed
+       while the find-bar is showing.
+
 2015-03-26  Peter Bloomfield  <pbloomfield bellsouth net>
 
        * src/store-address.c (store_address_dialog): grab the keyboard
diff --git a/src/balsa-message.c b/src/balsa-message.c
index 7b9bdb6..fb5d257 100644
--- a/src/balsa-message.c
+++ b/src/balsa-message.c
@@ -2324,9 +2324,7 @@ select_part(BalsaMessage * bm, BalsaPartInfo *info)
     GtkAdjustment *hadj, *vadj;
 
     hide_all_parts(bm);
-
-    if (bm->current_part)
-        g_object_unref(bm->current_part);
+    bm_disable_find_entry(bm);
 
     body = add_part(bm, info, bm->bm_widget->container);
     bm->current_part = part_info_from_body(bm, body);