Add Error History function and config var.

<error-history>, by default unbound, shows a list of the recent error
messages displayed by Mutt via mutt_message() or mutt_error().

$error_history sets the size of the history ring.

For now, I've decided to include mutt_message() messages too.  If this
is too chatty, we can restrict it to mutt_error() easily in the
future.

1 files changed, 5 insertions, 0 deletions

diff --git a/menu.c b/menu.c
index 8a6be010..dfd8fa75 100644
--- a/menu.c
+++ b/menu.c
@@ -1202,6 +1202,11 @@ int mutt_menuLoop (MUTTMENU *menu)
 	menu->redraw = REDRAW_FULL;
 	break;
 
+      case OP_ERROR_HISTORY:
+	mutt_error_history_display ();
+	menu->redraw = REDRAW_FULL;
+	break;
+
       case OP_NULL:
 	km_error_key (menu->menu);
 	break;