avoid unfocused workspace closing if window in the workspace is closed

parser-specs/config.spec

@@ -40,6 +40,7 @@ state INITIAL:
   'assign'                                 -> ASSIGN
   'no_focus'                               -> NO_FOCUS
   'focus_follows_mouse'                    -> FOCUS_FOLLOWS_MOUSE
+  'empty_workspaces'                       -> EMPTY_WORKSPACES
   'mouse_warping'                          -> MOUSE_WARPING
   'focus_wrapping'                         -> FOCUS_WRAPPING
   'force_focus_wrapping'                   -> FORCE_FOCUS_WRAPPING
@@ -269,6 +270,11 @@ state FOCUS_FOLLOWS_MOUSE:
   value = word
       -> call cfg_focus_follows_mouse($value)
 
+# empty_workspaces bool
+state EMPTY_WORKSPACES:
+  value = word
+      -> call cfg_empty_workspaces($value)
+
 # mouse_warping warping_t
 state MOUSE_WARPING:
   value = 'none', 'output'

src/con.c

@@ -2073,7 +2073,8 @@ static void con_on_remove_child(Con *con) {
 
     /* For workspaces, close them only if they're not visible anymore */
     if (con->type == CT_WORKSPACE) {
-        if (TAILQ_EMPTY(&(con->focus_head)) && !workspace_is_visible(con)) {
+        if (TAILQ_EMPTY(&(con->focus_head)) && !workspace_is_visible(con) &&
+            !config.empty_workspaces) {
             LOG("Closing old workspace (%p / %s), it is empty\n", con, con->name);
             yajl_gen gen = ipc_marshal_workspace_event("empty", con, NULL);
             tree_close_internal(con, DONT_KILL_WINDOW, false);