--- rxvt-unicode/src/perl/digital-clock	2006/01/03 01:15:44	1.2
+++ rxvt-unicode/src/perl/digital-clock	2006/01/03 01:29:55	1.4
@@ -5,6 +5,7 @@
 sub on_init {
    my ($self) = @_;
 
+   # force a refresh every second
    $self->{digital_clock_refresh} = urxvt::timer
                     ->new
                     ->start (urxvt::NOW)
@@ -16,23 +17,31 @@
    ()
 }
 
+# before refreshing: replace upper right with the clock display
 sub on_refresh_begin {
    my ($self) = @_;
 
    my $time = sprintf "%2d:%02d:%02d", (localtime urxvt::NOW)[2, 1, 0];
    my $xpos = $self->ncol - length $time;
 
-   $self->{digital_clock_rend} = $self->ROW_r (0, [(0x00020000 + urxvt::DEFAULT_RSTYLE) x length $time], $xpos);
+   $xpos >= 0
+      or return;
+
+   $self->{digital_clock_rend} = $self->ROW_r (0, [(urxvt::DEFAULT_RSTYLE) x length $time], $xpos);
    $self->{digital_clock_text} = $self->ROW_t (0, $time, $xpos);
 
    ()
 }
 
+# after refreshing: restore previous screen contents
 sub on_refresh_end {
    my ($self) = @_;
 
-   $self->ROW_r (0, $self->{digital_clock_rend});
-   $self->ROW_t (0, $self->{digital_clock_text});
+   exists $self->{digital_clock_text}
+      or return;
+
+   $self->ROW_r (0, delete $self->{digital_clock_rend});
+   $self->ROW_t (0, delete $self->{digital_clock_text});
 
    ()
 }