Fix ODR violation with MouseClick plugin

```
/var/tmp/portage/kde-plasma/kwin-6.0.49.9999/work/kwin-6.0.49.9999/src/input_event.h:21:7: error: type ‘struct MouseEvent’ violates the C++ One Definition Rule [-Werror=odr]
   21 | class MouseEvent : public QMouseEvent
      |       ^
/var/tmp/portage/kde-plasma/kwin-6.0.49.9999/work/kwin-6.0.49.9999/src/plugins/mouseclick/mouseclick.h:27:7: note: a type with different bases is defined in another translation unit
   27 | class MouseEvent
      |       ^
lto1: some warnings being treated as errors
```

Bug: https://bugs.gentoo.org/921558
Signed-off-by: Sam James <sam@gentoo.org>

src/plugins/mouseclick/mouseclick.cpp

@@ -139,7 +139,7 @@ void MouseClickEffect::postPaintScreen()
     repaint();
 }
 
-float MouseClickEffect::computeRadius(const MouseEvent *click, int ring)
+float MouseClickEffect::computeRadius(const MouseClickMouseEvent *click, int ring)
 {
     float ringDistance = m_ringLife / (m_ringCount * 3);
     if (click->m_press) {
@@ -148,7 +148,7 @@ float MouseClickEffect::computeRadius(const MouseEvent *click, int ring)
     return ((m_ringLife - click->m_time - ringDistance * ring) / m_ringLife) * m_ringMaxSize;
 }
 
-float MouseClickEffect::computeAlpha(const MouseEvent *click, int ring)
+float MouseClickEffect::computeAlpha(const MouseClickMouseEvent *click, int ring)
 {
     float ringDistance = m_ringLife / (m_ringCount * 3);
     return (m_ringLife - (float)click->m_time - ringDistance * (ring)) / m_ringLife;
@@ -162,16 +162,16 @@ void MouseClickEffect::slotMouseChanged(const QPointF &pos, const QPointF &,
         return;
     }
 
-    std::unique_ptr<MouseEvent> m;
+    std::unique_ptr<MouseClickMouseEvent> m;
     int i = BUTTON_COUNT;
     while (--i >= 0) {
         MouseButton *b = m_buttons[i].get();
         if (isPressed(b->m_button, buttons, oldButtons)) {
-            m = std::make_unique<MouseEvent>(i, pos.toPoint(), 0, createEffectFrame(pos.toPoint(), b->m_labelDown), true);
+            m = std::make_unique<MouseClickMouseEvent>(i, pos.toPoint(), 0, createEffectFrame(pos.toPoint(), b->m_labelDown), true);
             break;
         } else if (isReleased(b->m_button, buttons, oldButtons) && (!b->m_isPressed || b->m_time > m_ringLife)) {
             // we might miss a press, thus also check !b->m_isPressed, bug #314762
-            m = std::make_unique<MouseEvent>(i, pos.toPoint(), 0, createEffectFrame(pos.toPoint(), b->m_labelUp), false);
+            m = std::make_unique<MouseClickMouseEvent>(i, pos.toPoint(), 0, createEffectFrame(pos.toPoint(), b->m_labelUp), false);
             break;
         }
         b->setPressed(b->m_button & buttons);

src/plugins/mouseclick/mouseclick.h

@@ -24,10 +24,10 @@ namespace KWin
 
 class EffectFrame;
 
-class MouseEvent
+class MouseClickMouseEvent
 {
 public:
-    MouseEvent(int button, QPoint point, int time, std::unique_ptr<EffectFrame> &&frame, bool press)
+    MouseClickMouseEvent(int button, QPoint point, int time, std::unique_ptr<EffectFrame> &&frame, bool press)
         : m_button(button)
         , m_pos(point)
         , m_time(time)
@@ -131,8 +131,8 @@ private:
     inline bool isReleased(Qt::MouseButtons button, Qt::MouseButtons buttons, Qt::MouseButtons oldButtons);
     inline bool isPressed(Qt::MouseButtons button, Qt::MouseButtons buttons, Qt::MouseButtons oldButtons);
 
-    inline float computeRadius(const MouseEvent *click, int ring);
-    inline float computeAlpha(const MouseEvent *click, int ring);
+    inline float computeRadius(const MouseClickMouseEvent *click, int ring);
+    inline float computeAlpha(const MouseClickMouseEvent *click, int ring);
 
     void repaint();
 
@@ -150,7 +150,7 @@ private:
     QFont m_font;
     std::chrono::milliseconds m_lastPresentTime = std::chrono::milliseconds::zero();
 
-    std::deque<std::unique_ptr<MouseEvent>> m_clicks;
+    std::deque<std::unique_ptr<MouseClickMouseEvent>> m_clicks;
     std::unique_ptr<MouseButton> m_buttons[BUTTON_COUNT];
     QHash<quint64, TabletToolEvent> m_tabletTools;