[wayland] Configure key repeat

We take the configuration from the kcminputrc config file, group
keyboard (see plasma-desktop.git/kcms/keyboard/kcmmisc.cpp)

The values are only used for libinput. For backends providing input
events we expect to get repeated key events anyway.

input.cpp

@@ -293,6 +293,7 @@ InputRedirection::InputRedirection(QObject *parent)
     }
 #endif
     connect(kwinApp(), &Application::workspaceCreated, this, &InputRedirection::setupWorkspace);
+    reconfigure();
 }
 
 InputRedirection::~InputRedirection()
@@ -370,9 +371,24 @@ void InputRedirection::setupWorkspace()
                                                                  m_xkb->getGroup());
             }
         );
+        connect(workspace(), &Workspace::configChanged, this, &InputRedirection::reconfigure);
     }
 }
 
+void InputRedirection::reconfigure()
+{
+#if HAVE_INPUT
+    if (Application::usesLibinput()) {
+        const auto config = KSharedConfig::openConfig(QStringLiteral("kcminputrc"))->group(QStringLiteral("keyboard"));
+        const int delay = config.readEntry("RepeatDelay", 660);
+        const int rate = config.readEntry("RepeatRate", 25);
+        const bool enabled = config.readEntry("KeyboardRepeating", 0) == 0;
+
+        waylandServer()->seat()->setKeyRepeatInfo(enabled ? rate : 0, delay);
+    }
+#endif
+}
+
 static KWayland::Server::SeatInterface *findSeat()
 {
     auto server = waylandServer();

input.h

@@ -209,6 +209,7 @@ private:
     bool areButtonsPressed() const;
     void updateKeyboardWindow();
     void setupWorkspace();
+    void reconfigure();
     QPointF m_globalPointer;
     QHash<uint32_t, PointerButtonState> m_pointerButtons;
     QScopedPointer<Xkb> m_xkb;