Bugfix: set WM_STATE to WITHDRAWN when an app unmaps their window(s) (+test)

Fixes: #362

testcases/t/63-wm-state.t

@@ -0,0 +1,41 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Tests if WM_STATE is WM_STATE_NORMAL when mapped and WM_STATE_WITHDRAWN when
+# unmapped.
+#
+use X11::XCB qw(:all);
+use i3test;
+
+BEGIN {
+    use_ok('X11::XCB::Window');
+    use_ok('X11::XCB::Event::Generic');
+    use_ok('X11::XCB::Event::MapNotify');
+    use_ok('X11::XCB::Event::ClientMessage');
+}
+
+my $x = X11::XCB::Connection->new;
+
+my $window = $x->root->create_child(
+    class => WINDOW_CLASS_INPUT_OUTPUT,
+    rect => [ 0, 0, 30, 30 ],
+    background_color => '#00ff00',
+    event_mask => [ 'structure_notify' ],
+);
+
+$window->name('Window 1');
+$window->map;
+
+diag('window mapped');
+
+sleep 0.5;
+
+is($window->state, ICCCM_WM_STATE_NORMAL, 'WM_STATE normal');
+
+$window->unmap;
+
+sleep 0.5;
+
+is($window->state, ICCCM_WM_STATE_WITHDRAWN, 'WM_STATE withdrawn');
+
+done_testing;