When leaving fullscreen, set focus to con which was opened during fullscreen (+testcase) (Thanks dothebart)

src/manage.c

@@ -244,6 +244,12 @@ void manage_window(xcb_window_t window, xcb_get_window_attributes_cookie_t cooki
         else DLOG("dock, not focusing\n");
     } else {
         DLOG("fs = %p, ws = %p, not focusing\n", fs, ws);
+        /* Insert the new container in focus stack *after* the currently
+         * focused (fullscreen) con. This way, the new container will be
+         * focused after we return from fullscreen mode */
+        Con *first = TAILQ_FIRST(&(nc->parent->focus_head));
+        TAILQ_REMOVE(&(nc->parent->focus_head), nc, focused);
+        TAILQ_INSERT_AFTER(&(nc->parent->focus_head), first, nc, focused);
     }
 
     /* set floating if necessary */

testcases/t/56-fullscreen-focus.t

@@ -0,0 +1,65 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Test if new containers get focused when there is a fullscreen container at
+# the time of launching the new one.
+#
+use X11::XCB qw(:all);
+use Time::HiRes qw(sleep);
+use i3test;
+
+BEGIN {
+    use_ok('X11::XCB::Window');
+}
+
+my $x = X11::XCB::Connection->new;
+my $i3 = i3("/tmp/nestedcons");
+
+my $tmp = get_unused_workspace;
+cmd "workspace $tmp";
+
+#####################################################################
+# open the left window
+#####################################################################
+
+my $left = open_standard_window($x, '#ff0000');
+
+is($x->input_focus, $left->id, 'left window focused');
+
+diag("left = " . $left->id);
+
+#####################################################################
+# Open the right window
+#####################################################################
+
+my $right = open_standard_window($x, '#00ff00');
+
+diag("right = " . $right->id);
+
+#####################################################################
+# Set the right window to fullscreen
+#####################################################################
+cmd 'nop setting fullscreen';
+cmd 'fullscreen';
+
+#####################################################################
+# Open a third window
+#####################################################################
+
+my $third = open_standard_window($x, '#0000ff');
+
+diag("third = " . $third->id);
+
+# move the fullscreen window to a different ws
+
+my $tmp2 = get_unused_workspace;
+
+cmd "move workspace $tmp2";
+
+# verify that the third window has the focus
+
+sleep 0.25;
+
+is($x->input_focus, $third->id, 'third window focused');
+
+done_testing;

testcases/t/lib/i3test.pm

@@ -9,6 +9,7 @@ use X11::XCB qw(:all);
 use AnyEvent::I3;
 use List::Util qw(first);
 use List::MoreUtils qw(lastval);
+use Time::HiRes qw(sleep);
 use v5.10;
 
 use Exporter ();
@@ -41,12 +42,14 @@ use warnings;
 }
 
 sub open_standard_window {
-    my ($x) = @_;
+    my ($x, $color) = @_;
+
+    $color ||= '#c0c0c0';
 
     my $window = $x->root->create_child(
         class => WINDOW_CLASS_INPUT_OUTPUT,
         rect => [ 0, 0, 30, 30 ],
-        background_color => '#C0C0C0',
+        background_color => $color,
     );
 
     $window->name('Window ' . counter_window());