Comment 2 for bug 1563341

The patch above caused the following error later:

*** Can't use an undefined value as an ARRAY reference at /usr/bin/shutter line 3735.

which made all context menu items greyed out. An improved patch, which fixes the context menu display, follows:

@@ -3723,7 +3723,7 @@
                 #edit
                 if ( $n_items
                     && defined $key
- && defined @{ $session_screens{$key}->{'undo'} }
+ && $session_screens{$key}->{'undo'}
                     && scalar @{ $session_screens{$key}->{'undo'} } > 1 )
                 {
                     $sm->{_menuitem_undo}->set_sensitive(TRUE);
@@ -3734,7 +3734,7 @@

                 if ( $n_items
                     && defined $key
- && defined @{ $session_screens{$key}->{'redo'} }
+ && $session_screens{$key}->{'redo'}
                     && scalar @{ $session_screens{$key}->{'redo'} } > 0 )
                 {
                     $sm->{_menuitem_redo}->set_sensitive(TRUE);