Bugfix: `move <direction>` sends workspace focus

Make sure the command `move <direction>` properly sends the workspace
focus ipc event required for i3bar to be properly updated and redrawn.

Make `ipc_send_workspace_focus_event publicly available from ipc.h for
more flexible event sending.

include/ipc.h

@@ -82,4 +82,11 @@ void ipc_shutdown(void);
 
 void dump_node(yajl_gen gen, Con *con, bool inplace_restart);
 
+/**
+ * For the workspace "focus" event we send, along the usual "change" field,
+ * also the current and previous workspace, in "current" and "old"
+ * respectively.
+ */
+void ipc_send_workspace_focus_event(Con *current, Con *old);
+
 #endif

src/ipc.c

@@ -961,3 +961,37 @@ int ipc_create_socket(const char *filename) {
     current_socketpath = resolved;
     return sockfd;
 }
+
+/*
+ * For the workspace "focus" event we send, along the usual "change" field,
+ * also the current and previous workspace, in "current" and "old"
+ * respectively.
+ */
+void ipc_send_workspace_focus_event(Con *current, Con *old) {
+    setlocale(LC_NUMERIC, "C");
+    yajl_gen gen = ygenalloc();
+
+    y(map_open);
+
+    ystr("change");
+    ystr("focus");
+
+    ystr("current");
+    dump_node(gen, current, false);
+
+    ystr("old");
+    if (old == NULL)
+        y(null);
+    else
+        dump_node(gen, old, false);
+
+    y(map_close);
+
+    const unsigned char *payload;
+    ylength length;
+    y(get_buf, &payload, &length);
+
+    ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, (const char *)payload);
+    y(free);
+    setlocale(LC_NUMERIC, "");
+}

src/move.c

@@ -99,6 +99,7 @@ static void attach_to_workspace(Con *con, Con *ws, direction_t direction) {
  *
  */
 static void move_to_output_directed(Con *con, direction_t direction) {
+    Con *old_ws = con_get_workspace(con);
     Con *current_output_con = con_get_output(con);
     Output *current_output = get_output_by_name(current_output_con->name);
     Output *output = get_output_next(direction, current_output, CLOSEST_OUTPUT);
@@ -117,6 +118,16 @@ static void move_to_output_directed(Con *con, direction_t direction) {
     }
 
     attach_to_workspace(con, ws, direction);
+
+    /* fix the focus stack */
+    con_focus(con);
+
+    /* force re-painting the indicators */
+    FREE(con->deco_render_params);
+
+    tree_flatten(croot);
+
+    ipc_send_workspace_focus_event(ws, old_ws);
 }
 
 /*
@@ -137,7 +148,7 @@ void tree_move(int direction) {
     if (con->parent->type == CT_WORKSPACE && con_num_children(con->parent) == 1) {
         /* This is the only con on this workspace */
         move_to_output_directed(con, direction);
-        goto end;
+        return;
     }
 
     orientation_t o = (direction == D_LEFT || direction == D_RIGHT ? HORIZ : VERT);
@@ -191,7 +202,7 @@ void tree_move(int direction) {
                 /*  If we couldn't find a place to move it on this workspace,
                  *  try to move it to a workspace on a different output */
                 move_to_output_directed(con, direction);
-                goto end;
+                return;
             }
 
             /* If there was no con with which we could swap the current one,

src/workspace.c

@@ -11,9 +11,6 @@
  *
  */
 #include "all.h"
-#include "yajl_utils.h"
-
-#include <yajl/yajl_gen.h>
 
 /* Stores a copy of the name of the last used workspace for the workspace
  * back-and-forth switching. */
@@ -335,39 +332,6 @@ static void workspace_defer_update_urgent_hint_cb(EV_P_ ev_timer *w, int revents
     FREE(con->urgency_timer);
 }
 
-/*
- * For the "focus" event we send, along the usual "change" field, also the
- * current and previous workspace, in "current" and "old" respectively.
- */
-static void ipc_send_workspace_focus_event(Con *current, Con *old) {
-    setlocale(LC_NUMERIC, "C");
-    yajl_gen gen = ygenalloc();
-
-    y(map_open);
-
-    ystr("change");
-    ystr("focus");
-
-    ystr("current");
-    dump_node(gen, current, false);
-
-    ystr("old");
-    if (old == NULL)
-        y(null);
-    else
-        dump_node(gen, old, false);
-
-    y(map_close);
-
-    const unsigned char *payload;
-    ylength length;
-    y(get_buf, &payload, &length);
-
-    ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, (const char *)payload);
-    y(free);
-    setlocale(LC_NUMERIC, "");
-}
-
 static void _workspace_show(Con *workspace) {
     Con *current, *old = NULL;
 

testcases/t/517-regress-move-direction-ipc.t

@@ -0,0 +1,79 @@
+#!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)
+#
+# Make sure the command `move <direction>` properly sends the workspace focus
+# ipc event required for i3bar to be properly updated and redrawn.
+#
+# Bug still in: 4.6-195-g34232b8
+use i3test i3_autostart => 0;
+
+my $config = <<EOT;
+# i3 config file (v4)
+font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1
+
+fake-outputs 1024x768+0+0,1024x768+1024+0
+workspace ws-left output fake-0
+workspace ws-right output fake-1
+EOT
+
+my $pid = launch_with_config($config);
+
+my $i3 = i3(get_socket_path());
+$i3->connect()->recv;
+
+# subscribe to the 'focus' ipc event
+my $focus = AnyEvent->condvar;
+$i3->subscribe({
+    workspace => sub {
+        my ($event) = @_;
+        if ($event->{change} eq 'focus') {
+            $focus->send($event);
+        }
+    }
+})->recv;
+
+# give up after 0.5 seconds
+my $timer = AnyEvent->timer(
+    after => 0.5,
+    cb => sub {
+        $focus->send(0);
+    }
+);
+
+# open two windows on the left output
+cmd 'workspace ws-left';
+open_window;
+open_window;
+
+# move a window over to the right output
+cmd 'move right';
+my $event = $focus->recv;
+
+ok($event, 'moving from workspace with two windows triggered focus ipc event');
+is($event->{current}->{name}, 'ws-right', 'focus event gave the right workspace');
+is(@{$event->{current}->{nodes}}, 1, 'focus event gave the right number of windows on the workspace');
+
+# reset and try again
+$focus = AnyEvent->condvar;
+cmd 'workspace ws-left; move right';
+$event = $focus->recv;
+ok($event, 'moving from workspace with one window triggered focus ipc event');
+is($event->{current}->{name}, 'ws-right', 'focus event gave the right workspace');
+is(@{$event->{current}->{nodes}}, 2, 'focus event gave the right number of windows on the workspace');
+
+exit_gracefully($pid);
+
+done_testing;