do not use static_cast to downcast: can generate runtime issues

using a static_cast like this means that the compiler will not check the
validity of the cast

this could lead now or later to crash and other issues if the real type
is not the one in the cast

done with clang-tidy

run-clang-tidy -p build -header-filter='.*' -config="{Checks: '*', CheckOptions: [{key: UseAssignment, value: true}]}" -checks='-*,cppcoreguidelines-pro-type-static-cast-downcast' -fix

Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>

src/3rdparty/kirigami/wheelhandler.cpp

@@ -489,7 +489,7 @@ bool WheelHandler::eventFilter(QObject *watched, QEvent *event)
                 m_horizontalScrollBar->setProperty("interactive", true);
             }
         }
-        auto *wheelEvent = static_cast<QWheelEvent *>(event);
+        auto *wheelEvent = dynamic_cast<QWheelEvent *>(event);
 
         // NOTE: On X11 with libinput, pixelDelta is identical to angleDelta when using a mouse that shouldn't use pixelDelta.
         // If faulty pixelDelta, reset pixelDelta to (0,0).
@@ -555,7 +555,7 @@ bool WheelHandler::eventFilter(QObject *watched, QEvent *event)
 
     case QEvent::MouseButtonPress: {
         // NOTE: Flickable does not handle touch events, only synthesized mouse events
-        m_wasTouched = static_cast<QMouseEvent *>(event)->source() != Qt::MouseEventNotSynthesized;
+        m_wasTouched = dynamic_cast<QMouseEvent *>(event)->source() != Qt::MouseEventNotSynthesized;
         if (!m_filterMouseEvents) {
             break;
         }
@@ -577,7 +577,7 @@ bool WheelHandler::eventFilter(QObject *watched, QEvent *event)
         if (!m_filterMouseEvents) {
             break;
         }
-        if (static_cast<QMouseEvent *>(event)->source() == Qt::MouseEventNotSynthesized && item == m_flickable) {
+        if (dynamic_cast<QMouseEvent *>(event)->source() == Qt::MouseEventNotSynthesized && item == m_flickable) {
             return true;
         }
         break;
@@ -603,7 +603,7 @@ bool WheelHandler::eventFilter(QObject *watched, QEvent *event)
         if (!m_keyNavigationEnabled) {
             break;
         }
-        auto *keyEvent = static_cast<QKeyEvent *>(event);
+        auto *keyEvent = dynamic_cast<QKeyEvent *>(event);
         bool horizontalScroll = keyEvent->modifiers() & m_defaultHorizontalScrollModifiers;
         switch (keyEvent->key()) {
         case Qt::Key_Up: return scrollUp();