Remove crash handling in kwin_wayland

This patch introduces additional method to Application class
that has default policy of restarting the app.
This method is overridden for wayland case disabling this step.

REVIEW: 126655

main.cpp

@@ -211,9 +211,14 @@ void Application::destroyAtoms()
     atoms = nullptr;
 }
 
-void Application::crashChecking()
+void Application::setupCrashHandler()
 {
     KCrash::setEmergencySaveFunction(Application::crashHandler);
+}
+
+void Application::crashChecking()
+{
+    setupCrashHandler();
     if (crashes >= 4) {
         // Something has gone seriously wrong
         AlternativeWMDialog dialog;

main.h

@@ -177,6 +177,7 @@ Q_SIGNALS:
 protected:
     Application(OperationMode mode, int &argc, char **argv);
     virtual void performStartup() = 0;
+    virtual void setupCrashHandler();
 
     void notifyKSplash();
     void createInput();

main_wayland.cpp

@@ -122,6 +122,12 @@ void ApplicationWayland::performStartup()
     createBackend();
 }
 
+void ApplicationWayland::setupCrashHandler()
+{
+    // this disables auto-restart of kwin_wayland
+    // do nothing hence allowing OS to create dump and so on
+}
+
 void ApplicationWayland::createBackend()
 {
     AbstractBackend *backend = waylandServer()->backend();

main_wayland.h

@@ -56,6 +56,7 @@ public:
 
 protected:
     void performStartup() override;
+    void setupCrashHandler() override;
 
 private:
     void createBackend();