core: add an ANR dialog

for xdg-shell, we can ping the wm_base, and thus render an ANR dialog if an app dies

for XWayland, there probably is a similar method, but I don't know about it and don't care.

src/managers/ANRManager.hpp

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "../helpers/memory/Memory.hpp"
+#include "../desktop/DesktopTypes.hpp"
+#include <chrono>
+#include <hyprutils/os/Process.hpp>
+#include <hyprutils/os/FileDescriptor.hpp>
+#include <map>
+#include "./eventLoop/EventLoopTimer.hpp"
+#include "../helpers/signal/Signal.hpp"
+#include <atomic>
+#include <thread>
+
+class CXDGWMBase;
+
+class CANRManager {
+  public:
+    CANRManager();
+
+    void onResponse(SP<CXDGWMBase> wmBase);
+    bool isNotResponding(SP<CXDGWMBase> wmBase);
+
+  private:
+    bool                m_active = false;
+    SP<CEventLoopTimer> m_timer;
+
+    void                onTick();
+
+    struct SANRData {
+        ~SANRData();
+
+        int                         missedResponses = 0;
+        std::thread                 dialogThread;
+        SP<Hyprutils::OS::CProcess> dialogProc;
+        std::atomic<bool>           dialogThreadExited   = false;
+        std::atomic<bool>           dialogThreadSaidWait = false;
+
+        void                        runDialog(const std::string& title, const std::string& appName, const std::string appClass, pid_t dialogWmPID);
+        bool                        isThreadRunning();
+        void                        killDialog() const;
+    };
+
+    std::map<WP<CXDGWMBase>, SP<SANRData>> m_data;
+};
+
+inline UP<CANRManager> g_pANRManager;