Added a testcases for #1056 to test whether hovering over a window decoration causes the corresponding window to be

focused.

testcases/t/246-window-decoration-focus.t

@@ -0,0 +1,148 @@
+#!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)
+#
+# Ensure that hovering over the window decoration of a window causes it to focus
+# correctly.
+# Ticket: #1056
+# Bug still in: 4.10.2-174-g8029ff0
+use i3test;
+
+my ($ws, $A, $B, $C, $target, $y);
+my @cons;
+
+# ==================================================================================
+# Given the following layout (= denotes the window decoration),
+# when moving the mouse from 1 to 2,
+# then the C should be focused.
+#
+# This should especially be the case if B is the focus head of its vertically split parent container.
+#
+# +===A===+===B===+
+# |       |       |
+# |     1 +=2=C===+
+# |       |       |
+# +-------+-------+
+#
+# ==================================================================================
+
+$ws = fresh_workspace;
+
+open_window;
+$B = open_window;
+cmd 'split v';
+open_window;
+$target = get_focused($ws);
+
+@cons = @{get_ws($ws)->{nodes}};
+$A = $cons[0];
+$C = $cons[1]->{nodes}[1];
+
+$y = $C->{rect}->{y} - 0.5 * $C->{deco_rect}->{height};
+
+# make sure that B is the focus head of its parent
+cmd '[id="' . $B->{id} . '"] focus';
+
+# move pointer to position 1
+$x->root->warp_pointer($C->{rect}->{x} - 0.5 * $A->{rect}->{width}, $y);
+sync_with_i3;
+
+# move pointer to position 2
+$x->root->warp_pointer($C->{rect}->{x} + 0.5 * $C->{rect}->{width}, $y);
+sync_with_i3;
+
+is(get_focused($ws), $target, 'focus switched to container C');
+
+# ==================================================================================
+# Given a tabbed container when the mouse is moved onto the window decoration
+# then the focus head of the tabbed container is focused regardless of which particular
+# tab's decoration the mouse is on.
+#
+# +=========+=========+
+# |         |         |
+# |       1 +=2==|****| <- tab to the right is focus head of tabbed container
+# |         |         |
+# +---------+---------+
+#
+# ==================================================================================
+
+$ws = fresh_workspace;
+
+open_window;
+open_window;
+cmd 'split v';
+open_window;
+cmd 'split h';
+open_window;
+$target = get_focused($ws);
+cmd 'layout tabbed';
+
+@cons = @{get_ws($ws)->{nodes}};
+$A = $cons[0];
+$B = $cons[1]->{nodes}[1]->{nodes}[1];
+
+$y = $B->{rect}->{y} - 0.5 * $B->{deco_rect}->{height};
+
+$x->root->warp_pointer($B->{rect}->{x} - 0.5 * $A->{rect}->{width}, $y);
+sync_with_i3;
+
+$x->root->warp_pointer($B->{rect}->{x} + 0.2 * $B->{rect}->{width}, $y);
+sync_with_i3;
+
+is(get_focused($ws), $target, 'focus switched to the focus head of the tabbed container');
+
+# ==================================================================================
+# Given a stacked container when the mouse is moved onto the window decoration
+# then the focus head of the stacked container is focused regardless of which particular
+# tab's decoration the mouse is on.
+#
+# +=========+=========+
+# |         |         |
+# |       1 +=2=======+
+# |         +*********+ <- the lower tab is the focus head of the stacked container
+# |         |         |
+# +---------+---------+
+#
+# ==================================================================================
+
+$ws = fresh_workspace;
+
+open_window;
+open_window;
+cmd 'split v';
+open_window;
+cmd 'split h';
+open_window;
+$target = get_focused($ws);
+cmd 'layout stacked';
+
+@cons = @{get_ws($ws)->{nodes}};
+$A = $cons[0];
+$B = $cons[1]->{nodes}[1]->{nodes}[0];
+$C = $cons[1]->{nodes}[1]->{nodes}[1];
+
+$y = $B->{rect}->{y} - 1.5 * $B->{deco_rect}->{height};
+
+$x->root->warp_pointer($B->{rect}->{x} - 0.5 * $A->{rect}->{width}, $y);
+sync_with_i3;
+
+$x->root->warp_pointer($B->{rect}->{x} + 0.5 * $B->{rect}->{width}, $y);
+sync_with_i3;
+
+is(get_focused($ws), $target, 'focus switched to the focus head of the stacked container');
+
+# ==================================================================================
+
+done_testing;