Fix Sway #waybar.solo CSS rule applying on split

This error occurs because of an incorrect assumption that the size of
the list of nodes that contains the focused window is the number of
windows in a workspace.

The windows in a workspace are stored as a tree by Sway, rather than a
list, so the number of windows has to be found by counting the leaves of
a workspace tree.

src/modules/sway/window.cpp

@@ -64,29 +64,51 @@ auto Window::update() -> void {
   ALabel::update();
 }
 
-std::tuple<std::size_t, int, std::string, std::string> Window::getFocusedNode(
+int leafNodesInWorkspace(const Json::Value& node) {
-    const Json::Value& nodes, std::string& output) {
+  auto const& nodes = node["nodes"];
-  for (auto const& node : nodes) {
+  if(nodes.empty()) {
+    if(node["type"] == "workspace")
+      return 0;
+    else
+      return 1;
+  }
+  int sum = 0;
+  for(auto const& node : nodes)
+    sum += leafNodesInWorkspace(node);
+  return sum;
+}
+
+std::tuple<std::size_t, int, std::string, std::string> gfnWithWorkspace(
+    const Json::Value& nodes, std::string& output, const Json::Value& config_,
+    const Bar& bar_, Json::Value& parentWorkspace) {
+  for(auto const& node : nodes) {
     if (node["output"].isString()) {
       output = node["output"].asString();
     }
+    // found node
     if (node["focused"].asBool() && (node["type"] == "con" || node["type"] == "floating_con")) {
       if ((!config_["all-outputs"].asBool() && output == bar_.output->name) ||
           config_["all-outputs"].asBool()) {
         auto app_id = node["app_id"].isString() ? node["app_id"].asString()
                       : node["window_properties"]["instance"].asString();
-        return {nodes.size(),
+        int nb = node.size();
+        if(parentWorkspace != 0)
+          nb = leafNodesInWorkspace(parentWorkspace);
+        return {nb,
           node["id"].asInt(),
           Glib::Markup::escape_text(node["name"].asString()),
           app_id};
       }
     }
-    auto [nb, id, name, app_id] = getFocusedNode(node["nodes"], output);
+    // iterate
+    if(node["type"] == "workspace")
+      parentWorkspace = node;
+    auto [nb, id, name, app_id] = gfnWithWorkspace(node["nodes"], output, config_, bar_, parentWorkspace);
     if (id > -1 && !name.empty()) {
       return {nb, id, name, app_id};
     }
     // Search for floating node
-    std::tie(nb, id, name, app_id) = getFocusedNode(node["floating_nodes"], output);
+    std::tie(nb, id, name, app_id) = gfnWithWorkspace(node["floating_nodes"], output, config_, bar_, parentWorkspace);
     if (id > -1 && !name.empty()) {
       return {nb, id, name, app_id};
     }
@@ -94,6 +116,11 @@ std::tuple<std::size_t, int, std::string, std::string> Window::getFocusedNode(
   return {0, -1, "", ""};
 }
 
+std::tuple<std::size_t, int, std::string, std::string> Window::getFocusedNode(
+    const Json::Value& nodes, std::string& output) {
+  return gfnWithWorkspace(nodes, output, config_, bar_, placeholder);
+}
+
 void Window::getTree() {
   try {
     ipc_.sendCmd(IPC_GET_TREE);