various scrolling fixes for the effect keyframes

ui/keyframeview.cpp

@@ -167,7 +167,11 @@ void KeyframeView::paintEvent(QPaintEvent*) {
 
 	/*if (mouseover && mouseover_row < rowY.size()) {
 		draw_keyframe(p, getScreenPointFromFrame(panel_effect_controls->zoom, mouseover_frame - visible_in), rowY.at(mouseover_row), true);
-	}*/
+    }*/
+}
+
+void KeyframeView::wheelEvent(QWheelEvent *e) {
+    emit wheel_event_signal(e);
 }
 
 bool KeyframeView::keyframeIsSelected(EffectField *field, int keyframe) {

ui/keyframeview.h

@@ -21,6 +21,8 @@ public:
 
 	long visible_in;
 	long visible_out;
+signals:
+    void wheel_event_signal(QWheelEvent*);
 public slots:
 	void set_x_scroll(int);
 	void set_y_scroll(int);
@@ -36,6 +38,7 @@ private:
 	void mouseMoveEvent(QMouseEvent* event);
 	void mouseReleaseEvent(QMouseEvent *event);
 	void paintEvent(QPaintEvent *event);
+    void wheelEvent(QWheelEvent* e);
 	bool mousedown;
 	bool dragging;
 	bool keys_selected;