[balsa/gtk3] Do not crash by passing unowned string

[Peter Bloomfield <PeterB src gnome org>]

commit f4d4eddc1c5aca67ca18acae58a9d102cc4b0203
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Wed Mar 6 20:09:51 2013 -0500

    Do not crash by passing unowned string
    
        * src/main.c (scan_mailboxes_idle_cb): do not pass unowned
        string.

 ChangeLog  |    5 +++++
 src/main.c |    3 ++-
 2 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index d52398e..552aa99 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2013-03-06  Peter Bloomfield
 
+       * src/main.c (scan_mailboxes_idle_cb): do not pass unowned
+       string.
+
+2013-03-06  Peter Bloomfield
+
        Combine all mailboxes to be opened at startup into a single
        array.
 
diff --git a/src/main.c b/src/main.c
index d156061..6843d65 100644
--- a/src/main.c
+++ b/src/main.c
@@ -428,7 +428,8 @@ scan_mailboxes_idle_cb()
 
     if (balsa_app.remember_open_mboxes) {
         if (balsa_app.current_mailbox_url)
-            g_ptr_array_add(url_array, balsa_app.current_mailbox_url);
+            g_ptr_array_add(url_array,
+                            g_strdup(balsa_app.current_mailbox_url));
         balsa_add_open_mailbox_urls(url_array);
     }