Make canvas ports and groups ignore middle mouse clicks

Fixes #1085

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

source/frontend/patchcanvas/canvasbox.py

@@ -612,6 +612,10 @@ class CanvasBox(QGraphicsObject):
         QGraphicsObject.mouseDoubleClickEvent(self, event)
 
     def mousePressEvent(self, event):
+        if event.button() == Qt.MiddleButton or event.source() == Qt.MouseEventSynthesizedByApplication:
+            event.ignore()
+            return
+
         canvas.last_z_value += 1
         self.setZValue(canvas.last_z_value)
         self.resetLinesZValue()

source/frontend/patchcanvas/canvasport.py

@@ -147,6 +147,10 @@ class CanvasPort(QGraphicsItem):
         QGraphicsItem.hoverLeaveEvent(self, event)
 
     def mousePressEvent(self, event):
+        if event.button() == Qt.MiddleButton or event.source() == Qt.MouseEventSynthesizedByApplication:
+            event.ignore()
+            return
+
         if self.m_mouse_down:
             self.handleMouseRelease()
         self.m_hover_item = None

source/frontend/widgets/draggablegraphicsview.py

@@ -119,7 +119,8 @@ class DraggableGraphicsView(QGraphicsView):
         if event.button() == self.fMiddleButton and not self.fCtrlDown:
             self.fPanning = True
             self.setDragMode(QGraphicsView.ScrollHandDrag)
-            event = QMouseEvent(event.type(), event.pos(), Qt.LeftButton, Qt.LeftButton, event.modifiers())
+            event = QMouseEvent(event.type(), event.localPos(), event.windowPos(), event.screenPos(),
+                                Qt.LeftButton, Qt.LeftButton, event.modifiers(), Qt.MouseEventSynthesizedByApplication)
 
         QGraphicsView.mousePressEvent(self, event)