tests: add testcase for the focus when moving floating con to other ws problem

testcases/t/48-regress-floatingmovews.t

@@ -0,0 +1,39 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Regression test for correct focus behaviour when moving a floating con to
+# another workspace.
+#
+use X11::XCB qw(:all);
+use Time::HiRes qw(sleep);
+use i3test tests => 2;
+
+BEGIN {
+    use_ok('X11::XCB::Window');
+}
+
+my $x = X11::XCB::Connection->new;
+
+my $tmp = get_unused_workspace;
+cmd "workspace $tmp";
+
+# open a tiling window on the first workspace
+open_standard_window($x);
+sleep 0.25;
+my $first = get_focused($tmp);
+
+# on a different ws, open a floating window
+my $otmp = get_unused_workspace;
+cmd "workspace $otmp";
+open_standard_window($x);
+sleep 0.25;
+my $float = get_focused($otmp);
+cmd 'mode toggle';
+sleep 0.25;
+
+# move the floating con to first workspace
+cmd "move workspace $tmp";
+sleep 0.25;
+
+# switch to the first ws and check focus
+is(get_focused($tmp), $float, 'floating client correctly focused');