More Qt workarounds in canvas

If other cases cause crash, these might too perhaps

Signed-off-by: falkTX <falktx@gmail.com>

source/frontend/patchcanvas/canvasbezierline.py

@@ -45,7 +45,8 @@ from .canvasportglow import CanvasPortGlow
 
 class CanvasBezierLine(QGraphicsPathItem):
     def __init__(self, item1, item2, parent):
-        QGraphicsPathItem.__init__(self, parent)
+        QGraphicsPathItem.__init__(self)
+        self.setParentItem(parent)
 
         self.item1 = item1
         self.item2 = item2

source/frontend/patchcanvas/canvasbox.py

@@ -74,7 +74,8 @@ class cb_line_t(object):
 
 class CanvasBox(QGraphicsItem):
     def __init__(self, group_id, group_name, icon, parent=None):
-        QGraphicsItem.__init__(self, parent)
+        QGraphicsItem.__init__(self)
+        self.setParentItem(parent)
 
         # Save Variables, useful for later
         self.m_group_id = group_id

source/frontend/patchcanvas/canvasicon.py

@@ -43,7 +43,8 @@ from . import (
 
 class CanvasIcon(QGraphicsSvgItem):
     def __init__(self, icon, name, parent):
-        QGraphicsSvgItem.__init__(self, parent)
+        QGraphicsSvgItem.__init__(self)
+        self.setParentItem(parent)
 
         self.m_renderer = None
         self.p_size = QRectF(0, 0, 0, 0)

source/frontend/patchcanvas/canvasline.py

@@ -45,7 +45,8 @@ from .canvasportglow import CanvasPortGlow
 
 class CanvasLine(QGraphicsLineItem):
     def __init__(self, item1, item2, parent):
-        QGraphicsLineItem.__init__(self, parent)
+        QGraphicsLineItem.__init__(self)
+        self.setParentItem(parent)
 
         self.item1 = item1
         self.item2 = item2

source/frontend/patchcanvas/canvasport.py

@@ -57,7 +57,8 @@ from .utils import CanvasGetFullPortName, CanvasGetPortConnectionList
 
 class CanvasPort(QGraphicsItem):
     def __init__(self, group_id, port_id, port_name, port_mode, port_type, is_alternate, parent):
-        QGraphicsItem.__init__(self, parent)
+        QGraphicsItem.__init__(self)
+        self.setParentItem(parent)
 
         # Save Variables, useful for later
         self.m_group_id = group_id