Bugfix: Don’t mess up x/y coordinates in configurerequests for floating windows

This was the cause for ticket #93, which actually has a false
conclusion for the reason of this bug.

This code needs to be refactored.

src/handlers.c

@@ -341,11 +341,31 @@ int handle_configure_request(void *prophs, xcb_connection_t *conn, xcb_configure
         if (client_is_floating(client)) {
                 i3Font *font = load_font(conn, config.font);
                 int mode = (client->container != NULL ? client->container->mode : MODE_DEFAULT);
+                /* TODO: refactor this code. we need a function to translate
+                 * coordinates of child_rect/rect. */
 
-                if (event->value_mask & XCB_CONFIG_WINDOW_X)
+                if (event->value_mask & XCB_CONFIG_WINDOW_X) {
+                        if (mode == MODE_STACK || mode == MODE_TABBED) {
+                                client->rect.x = event->x - 2;
+                        } else {
+                                if (client->titlebar_position == TITLEBAR_OFF && client->borderless)
                                         client->rect.x = event->x;
-                if (event->value_mask & XCB_CONFIG_WINDOW_Y)
+                                else if (client->titlebar_position == TITLEBAR_OFF && !client->borderless)
+                                        client->rect.x = event->x - 1;
+                                else client->rect.x = event->x - 2;
+                        }
+                }
+                if (event->value_mask & XCB_CONFIG_WINDOW_Y) {
+                        if (mode == MODE_STACK || mode == MODE_TABBED) {
+                                client->rect.y = event->y - 2;
+                        } else {
+                                if (client->titlebar_position == TITLEBAR_OFF && client->borderless)
                                         client->rect.y = event->y;
+                                else if (client->titlebar_position == TITLEBAR_OFF && !client->borderless)
+                                        client->rect.y = event->y - 1;
+                                else client->rect.y = event->y - font->height - 2 - 2;
+                        }
+                }
                 if (event->value_mask & XCB_CONFIG_WINDOW_WIDTH) {
                         if (mode == MODE_STACK || mode == MODE_TABBED) {
                                 client->rect.width = event->width + 2 + 2;

testcases/t/12-floating-resize.t

@@ -0,0 +1,90 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+# Beware that this test uses workspace 9 to perform some tests (it expects
+# the workspace to be empty).
+# TODO: skip it by default?
+
+use Test::More tests => 17;
+use Test::Deep;
+use X11::XCB qw(:all);
+use Data::Dumper;
+use Time::HiRes qw(sleep);
+use FindBin;
+use Digest::SHA1 qw(sha1_base64);
+use lib "$FindBin::Bin/lib";
+use i3test;
+
+BEGIN {
+    use_ok('IO::Socket::UNIX') or BAIL_OUT('Cannot load IO::Socket::UNIX');
+    use_ok('X11::XCB::Connection') or BAIL_OUT('Cannot load X11::XCB::Connection');
+}
+
+my $x = X11::XCB::Connection->new;
+
+my $sock = IO::Socket::UNIX->new(Peer => '/tmp/i3-ipc.sock');
+isa_ok($sock, 'IO::Socket::UNIX');
+
+# Switch to the nineth workspace
+$sock->write(i3test::format_ipc_command("9"));
+
+sleep 0.25;
+
+#####################################################################
+# Create a floating window and see if resizing works
+#####################################################################
+
+# Create a floating window
+my $window = $x->root->create_child(
+    class => WINDOW_CLASS_INPUT_OUTPUT,
+    rect => [ 0, 0, 30, 30],
+    background_color => '#C0C0C0',
+    # replace the type with 'utility' as soon as the coercion works again in X11::XCB
+    type => $x->atom(name => '_NET_WM_WINDOW_TYPE_UTILITY'),
+);
+
+isa_ok($window, 'X11::XCB::Window');
+
+$window->map;
+sleep 0.25;
+
+# See if configurerequests cause window movements (they should not)
+my ($a, $t) = $window->rect;
+$window->rect(X11::XCB::Rect->new(x => $a->x, y => $a->y, width => $a->width, height => $a->height));
+
+sleep 0.25;
+my ($na, $nt) = $window->rect;
+is_deeply($na, $a, 'Rects are equal after configurerequest');
+
+sub test_resize {
+    $window->rect(X11::XCB::Rect->new(x => 0, y => 0, width => 100, height => 100));
+
+    my ($absolute, $top) = $window->rect;
+
+    # Make sure the width/height are different from what we’re gonna test, so
+    # that the test will work.
+    isnt($absolute->width, 300, 'width != 300');
+    isnt($absolute->height, 500, 'height != 500');
+
+    $window->rect(X11::XCB::Rect->new(x => 0, y => 0, width => 300, height => 500));
+    sleep 0.25;
+
+    ($absolute, $top) = $window->rect;
+
+    is($absolute->width, 300, 'width = 300');
+    is($absolute->height, 500, 'height = 500');
+}
+
+# Test with default border
+test_resize;
+
+# Test borderless
+$sock->write(i3test::format_ipc_command("bb"));
+sleep 0.25;
+
+test_resize;
+
+# Test with 1-px-border
+$sock->write(i3test::format_ipc_command("bp"));
+sleep 0.25;
+
+test_resize;