Focus windows upon ConfigureWindow with stack-mode=Above (#2865)

fixes #2708
fixes #2745

testcases/t/269-focus-stack-above.t

@@ -0,0 +1,39 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Please read the following documents before working on tests:
+# • http://build.i3wm.org/docs/testsuite.html
+#   (or docs/testsuite)
+#
+# • http://build.i3wm.org/docs/lib-i3test.html
+#   (alternatively: perldoc ./testcases/lib/i3test.pm)
+#
+# • http://build.i3wm.org/docs/ipc.html
+#   (or docs/ipc)
+#
+# • http://onyxneon.com/books/modern_perl/modern_perl_a4.pdf
+#   (unless you are already familiar with Perl)
+#
+# Verifies a ConfigureWindow request with stack-mode=Above is translated into
+# focusing the target window by i3.
+# Ticket: #2708
+# Bug still in: 4.13-207-gafdf6792
+use i3test;
+use X11::XCB qw(CONFIG_WINDOW_STACK_MODE STACK_MODE_ABOVE);
+
+my $ws = fresh_workspace;
+my $left_window = open_window;
+my $right_window = open_window;
+
+is($x->input_focus, $right_window->id, 'right window has focus');
+my $old_focus = get_focused($ws);
+
+$x->configure_window($left_window->id, CONFIG_WINDOW_STACK_MODE, (STACK_MODE_ABOVE));
+$x->flush;
+
+sync_with_i3;
+
+is($x->input_focus, $left_window->id, 'left window has focus');
+isnt(get_focused($ws), $old_focus, 'right window is no longer focused');
+
+done_testing;