Fine-tuned box coordinates, depending on line width

Necessary for classic theme. Now it will look like in latest patchage/ingen series.

src/patchcanvas.py

@@ -2454,6 +2454,7 @@ class CanvasBox(QGraphicsItem):
 
     def paint(self, painter, option, widget):
         painter.save()
+        line_width = canvas.theme.box_pen.widthF()
 
         # Draw rectangle
         if self.isSelected():
@@ -2469,22 +2470,22 @@ class CanvasBox(QGraphicsItem):
         else:
             painter.setBrush(canvas.theme.box_bg_1)
 
-        painter.drawRoundedRect(QRectF(0.5, 0.5, self.p_width-1, self.p_height-1), canvas.theme.box_rounding, canvas.theme.box_rounding)
+        painter.drawRoundedRect(QRectF(line_width/2, line_width/2, self.p_width-line_width, self.p_height-line_width), canvas.theme.box_rounding, canvas.theme.box_rounding)
 
         # Draw pixmap header
         if canvas.theme.box_header_pixmap:
             painter.setPen(Qt.NoPen)
             painter.setBrush(canvas.theme.box_bg_2)
-            painter.drawRoundedRect(QRectF(1, 1, self.p_width-2, canvas.theme.box_header_height), canvas.theme.box_rounding-0.5, canvas.theme.box_rounding-0.5)
+            painter.drawRoundedRect(QRectF(line_width, line_width, self.p_width-line_width*2, canvas.theme.box_header_height), canvas.theme.box_rounding-0.5, canvas.theme.box_rounding-0.5)
 
             # Including pixmap clip path
             clipPath = QPainterPath()
-            clipPath.addRoundedRect(QRectF(1+1, 1+1, self.p_width-2-2, canvas.theme.box_header_height-2), canvas.theme.box_rounding-1.5, canvas.theme.box_rounding-1.5)
+            clipPath.addRoundedRect(QRectF(line_width+1, line_width+1, self.p_width-2-line_width*2, canvas.theme.box_header_height-2), canvas.theme.box_rounding-1.5, canvas.theme.box_rounding-1.5)
             painter.setClipPath(clipPath)
             painter.setClipping(True)
 
             headerPos  = QPointF(1, 1)
-            headerRect = QRectF(2, 2, self.p_width-4, canvas.theme.box_header_height-3)
+            headerRect = QRectF(line_width+1, line_width+1, self.p_width-2-line_width*2, canvas.theme.box_header_height-2-line_width)
             painter.drawTiledPixmap(headerRect, canvas.theme.box_header_pixmap, headerPos)
 
             painter.setClipping(False)