Use the original geometry for floating windows

testcases/t/53-floating-originalsize.t

@@ -0,0 +1,52 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Test if the requested width/height is set after making the window floating.
+#
+use Time::HiRes qw(sleep);
+use X11::XCB qw(:all);
+use i3test;
+
+my $tmp = get_unused_workspace;
+cmd "workspace $tmp";
+
+my $x = X11::XCB::Connection->new;
+
+# Create a floating window which is smaller than the minimum enforced size of i3
+my $window = $x->root->create_child(
+    class => WINDOW_CLASS_INPUT_OUTPUT,
+    rect => [ 0, 0, 400, 150],
+    background_color => '#C0C0C0',
+);
+
+isa_ok($window, 'X11::XCB::Window');
+
+$window->map;
+
+sleep 0.25;
+
+my ($absolute, $top) = $window->rect;
+
+ok($window->mapped, 'Window is mapped');
+cmp_ok($absolute->{width}, '>', 400, 'i3 raised the width');
+cmp_ok($absolute->{height}, '>', 150, 'i3 raised the height');
+
+cmd 'mode toggle';
+sleep 0.25;
+
+($absolute, $top) = $window->rect;
+
+diag('new width: ' . $absolute->{width});
+diag('new height: ' . $absolute->{height});
+
+# we compare with a tolerance of ± 20 pixels for borders in each direction
+# (overkill, but hey)
+cmp_ok($absolute->{width}, '>', 400-20, 'width now > 380');
+cmp_ok($absolute->{width}, '<', 400+20, 'width now < 420');
+cmp_ok($absolute->{height}, '>', 150-20, 'height now > 130');
+cmp_ok($absolute->{height}, '<', 150+20, 'height now < 170');
+
+#cmp_ok($absolute->{width}, '>=', 75, 'i3 raised the width to 75');
+#cmp_ok($absolute->{height}, '>=', 50, 'i3 raised the height to 50');
+
+done_testing;