migration: fix unexpected QWidget border

Author: ChinaIceF

examples/Gallery for siui/start.py

@@ -38,6 +38,7 @@ def show_version_message(window):
 
 if __name__ == "__main__":
     app = QApplication(sys.argv)
+    app.setStyle("Fusion")
 
     window = MySiliconApp()
     window.show()

siui/components/chart.py

@@ -159,7 +159,7 @@ def event(self, event):
 
     def _isMousePosValid(self, pos: QPoint) -> bool:
         rect = self._getChartRect()
-        return rect.contains(pos)
+        return rect.contains(pos.toPointF())
 
     def _findClosestDataPoint(self, cx: float) -> QPointF:
         distances = [(abs(point.x() - cx), point) for point in self._shown_point_list]