wayland: Reload key-repeat settings when kcminputrc changes

At the moment, if key repeat settings are changed in the input kcm, kwin
will do nothing.

input.cpp

@@ -2092,7 +2092,6 @@ void InputRedirection::setupWorkspace()
                 );
             }
         );
-        connect(workspace(), &Workspace::configChanged, this, &InputRedirection::reconfigure);
 
         m_keyboard->init();
         m_pointer->init();
@@ -2148,11 +2147,17 @@ void InputRedirection::setupInputFilters()
     }
 }
 
+void InputRedirection::handleInputConfigChanged(const KConfigGroup &group)
+{
+    if (group.name() == QLatin1String("Keyboard")) {
+        reconfigure();
+    }
+}
+
 void InputRedirection::reconfigure()
 {
     if (Application::usesLibinput()) {
-        auto inputConfig = InputConfig::self()->inputConfig();
-        inputConfig->reparseConfiguration();
+        auto inputConfig = m_inputConfigWatcher->config();
         const auto config = inputConfig->group(QStringLiteral("Keyboard"));
         const int delay = config.readEntry("RepeatDelay", 660);
         const int rate = config.readEntry("RepeatRate", 25);
@@ -2293,10 +2298,14 @@ void InputRedirection::setupLibInput()
                 }
             }
         );
+
+        m_inputConfigWatcher = KConfigWatcher::create(InputConfig::self()->inputConfig());
+        connect(m_inputConfigWatcher.data(), &KConfigWatcher::configChanged,
+                this, &InputRedirection::handleInputConfigChanged);
+        reconfigure();
     }
 
     setupTouchpadShortcuts();
-    reconfigure();
 }
 
 void InputRedirection::setupTouchpadShortcuts()

input.h

@@ -17,6 +17,7 @@
 #include <QPointer>
 #include <config-kwin.h>
 
+#include <KConfigWatcher>
 #include <KSharedConfig>
 #include <QSet>
 
@@ -296,6 +297,9 @@ Q_SIGNALS:
     void hasAlphaNumericKeyboardChanged(bool set);
     void hasTabletModeSwitchChanged(bool set);
 
+private Q_SLOTS:
+    void handleInputConfigChanged(const KConfigGroup &group);
+
 private:
     void setupLibInput();
     void setupTouchpadShortcuts();
@@ -318,6 +322,7 @@ private:
 
     QVector<InputEventFilter*> m_filters;
     QVector<InputEventSpy*> m_spies;
+    KConfigWatcher::Ptr m_inputConfigWatcher;
 
     KWIN_SINGLETON(InputRedirection)
     friend InputRedirection *input();