[plasma/kwin] src/effect: Fix event type forward declarations

Git commit 0c1b4ca0ac4bc01ec9d829fe896530a8664bc10d by Vlad Zahorodnii.
Committed on 23/07/2026 at 08:27.
Pushed by vladz into branch 'master'.

Fix event type forward declarations

These are structs. It fixes a lot of warnings when building kwin with
clang.

M  +3    -3    src/effect/effect.h
M  +5    -5    src/effect/offscreenquickview.h

https://invent.kde.org/plasma/kwin/-/commit/0c1b4ca0ac4bc01ec9d829fe896530a8664bc10d

diff --git a/src/effect/effect.h b/src/effect/effect.h
index 91c64215474..7bab42ad2da 100644
--- a/src/effect/effect.h
+++ b/src/effect/effect.h
@@ -23,10 +23,10 @@ namespace KWin
 class EffectWindow;
 class LogicalOutput;
 class PaintDataPrivate;
-class PointerAxisEvent;
+struct PointerAxisEvent;
 class RenderTarget;
-class PointerButtonEvent;
-class PointerMotionEvent;
+struct PointerButtonEvent;
+struct PointerMotionEvent;
 class RenderViewport;
 struct TabletToolProximityEvent;
 struct TabletToolTipEvent;
diff --git a/src/effect/offscreenquickview.h b/src/effect/offscreenquickview.h
index e15a224338a..11c0610c5a1 100644
--- a/src/effect/offscreenquickview.h
+++ b/src/effect/offscreenquickview.h
@@ -32,11 +32,11 @@ namespace KWin
 class GLTexture;
 
 class OffscreenQuickView;
-class PointerAxisEvent;
-class PointerButtonEvent;
-class PointerMotionEvent;
-class TabletToolTipEvent;
-class TabletToolAxisEvent;
+struct PointerAxisEvent;
+struct PointerButtonEvent;
+struct PointerMotionEvent;
+struct TabletToolTipEvent;
+struct TabletToolAxisEvent;
 class OutputFrame;
 
 /**