fix: ignore stale coordinate data for panels + convert wavyline to use new qt 6.12 canvas painter api

Plugins/ZShell/Components/wavyline.hpp

@@ -1,11 +1,14 @@
 #pragma once
 
 #include <qqmlintegration.h>
-#include <qquickpainteditem.h>
+#include <QCanvasPainterItem>
+#include <QColor>
 
 namespace ZShell::controls {
 
-class WavyLine : public QQuickPaintedItem {
+class WavyLineRenderer;
+
+class WavyLine : public QCanvasPainterItem {
 	Q_OBJECT
 	QML_ELEMENT
 
@@ -82,9 +85,7 @@ class WavyLine : public QQuickPaintedItem {
 	[[nodiscard]] qreal value() const;
 	void setValue(qreal value);
 
-	void paint(QPainter* painter) override;
-
-	signals:
+signals:
 	void lineWidthChanged();
 	void amplitudeMultiplierChanged();
 	void frequencyChanged();
@@ -98,9 +99,12 @@ class WavyLine : public QQuickPaintedItem {
 	void radiusChanged();
 	void valueChanged();
 
+	protected:
+	[[nodiscard]] QCanvasPainterItemRenderer* createItemRenderer()
+		const override;
+
 	private:
-	void paintLinear(QPainter* painter);
-	void paintArc(QPainter* painter);
+	friend class WavyLineRenderer;
 
 	int m_lineWidth;
 	qreal m_amplitudeMultiplier;
@@ -114,8 +118,6 @@ class WavyLine : public QQuickPaintedItem {
 	qreal m_fullAngle;
 	qreal m_radius;
 	qreal m_value;
-	qreal m_startAngleRad;
-	qreal m_fullAngleRad;
 };
 
 } // namespace ZShell::controls