fix(wlr/taskbar): dispatch built-in click actions via doAction, not the shell

wlr/taskbar reads on-click* config values (close, minimize, maximize,
fullscreen, minimize-raise, activate) directly as internal actions in
Task::handle_clicked, but never adopted the eventActionMap_/doAction
mechanism. As a result AModule::handleUserEvent additionally forkExec-ed
the same value as a shell command, e.g. on-click-middle: "close" ran the
action and then failed with "sh: line 1: close: command not found".

Register the taskbar built-in action names in eventActionMap_ so they are
recognized as module actions, and skip the shell forkExec in
handleUserEvent when the configured value is a recognized module action.
Non-action values are still run as user shell commands.

Fixes #3284.

include/AModule.hpp

@@ -98,6 +98,13 @@ class AModule : public IModule {
   bool disable_on_sleep_{false};
   GObject* menu_ = nullptr;
 
+  // Maps a configured event name (e.g. "on-click-middle") to a built-in module
+  // action name. Populated from the `actions` config section, and by modules
+  // that interpret on-click* config values as internal actions (e.g.
+  // wlr/taskbar). Entries here are dispatched through doAction() instead of
+  // being run as shell commands.
+  std::map<std::string, std::string> eventActionMap_;
+
  private:
   bool handleUserEvent(GdkEventButton* const& ev);
   const bool isTooltip;
@@ -106,7 +113,6 @@ class AModule : public IModule {
   gdouble distance_scrolled_y_;
   gdouble distance_scrolled_x_;
   sigc::connection cursor_timeout_conn_;
-  std::map<std::string, std::string> eventActionMap_;
   static const inline std::map<std::pair<uint, GdkEventType>, std::string> eventMap_{
       {std::make_pair(1, GdkEventType::GDK_BUTTON_PRESS), "on-click"},
       {std::make_pair(1, GdkEventType::GDK_BUTTON_RELEASE), "on-click-release"},

src/AModule.cpp

@@ -222,10 +222,18 @@ bool AModule::handleUserEvent(GdkEventButton* const& e) {
   }
   // Second call user scripts
   if (!format.empty()) {
-    if (config_[format].isString())
-      format = config_[format].asString();
-    else
+    // If the configured value for this event is a recognized built-in module
+    // action (registered in eventActionMap_), it has already been dispatched
+    // via doAction() above / handled by the module itself. Don't additionally
+    // run it as a shell command (issue #3284). Any other value is still treated
+    // as a user shell command.
+    const auto actionIt = eventActionMap_.find(format);
+    const bool isModuleAction = actionIt != eventActionMap_.cend() && config_[format].isString() &&
+                                config_[format].asString() == actionIt->second;
+    if (isModuleAction || !config_[format].isString())
       format.clear();
+    else
+      format = config_[format].asString();
   }
   if (!format.empty()) {
     const int width = gdk_window_get_width(e->window);

src/modules/wlr/taskbar.cpp

@@ -696,6 +696,21 @@ Taskbar::Taskbar(const std::string& id, const waybar::Bar& bar, const Json::Valu
   box_.get_style_context()->add_class("empty");
   event_box_.add(box_);
 
+  // wlr/taskbar interprets on-click* config values as built-in actions, handled
+  // per-task in Task::handle_clicked. Register the recognized action names so
+  // AModule dispatches them via doAction() instead of also running them as shell
+  // commands (issue #3284). Values that are not built-in actions are left alone
+  // and still run as user shell commands.
+  const auto is_builtin_action = [](const std::string& v) {
+    return v == "activate" || v == "minimize" || v == "minimize-raise" || v == "maximize" ||
+           v == "fullscreen" || v == "close";
+  };
+  for (const auto* event : {"on-click", "on-click-middle", "on-click-right"}) {
+    if (config_[event].isString() && is_builtin_action(config_[event].asString())) {
+      eventActionMap_.insert({event, config_[event].asString()});
+    }
+  }
+
   // Make task buttons distribute evenly across the available width.
   if (config_["homogeneous"].isBool() && config_["homogeneous"].asBool()) {
     box_.set_homogeneous(true);