add a testcase for the previous commit

testcases/t/190-scratchpad-diff-ws.t

@@ -0,0 +1,59 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Test for ticket #676: 'scratchpad show' causes a segfault if the scratchpad
+# window is shown on another workspace.
+#
+use i3test;
+use List::Util qw(first);
+use X11::XCB qw(:all);
+
+my $i3 = i3(get_socket_path());
+my $tmp = fresh_workspace;
+
+# TODO: move to X11::XCB
+sub set_wm_class {
+    my ($id, $class, $instance) = @_;
+
+    # Add a _NET_WM_STRUT_PARTIAL hint
+    my $atomname = $x->atom(name => 'WM_CLASS');
+    my $atomtype = $x->atom(name => 'STRING');
+
+    $x->change_property(
+        PROP_MODE_REPLACE,
+        $id,
+        $atomname->id,
+        $atomtype->id,
+        8,
+        length($class) + length($instance) + 2,
+        "$instance\x00$class\x00"
+    );
+}
+
+sub open_special {
+    my %args = @_;
+    my $wm_class = delete($args{wm_class}) || 'special';
+
+    return open_window(
+        %args,
+        before_map => sub { set_wm_class($_->id, $wm_class, $wm_class) },
+    );
+}
+
+my $win = open_window;
+
+my $scratch = open_special;
+cmd '[class="special"] move scratchpad';
+
+my ($nodes, $focus) = get_ws_content($tmp);
+is(scalar @$nodes, 1, 'one window on current ws');
+
+my $otmp = fresh_workspace;
+cmd 'scratchpad show';
+
+cmd "workspace $tmp";
+cmd '[class="special"] scratchpad show';
+
+does_i3_live;
+
+done_testing;