CAM: fix the transform tool

(cherry picked from commit f238a5f4e5)

src/Gui/Inventor/Draggers/SoTransformDragger.cpp

@@ -489,7 +489,14 @@ void SoTransformDragger::setUpAutoScale(SoCamera* cameraIn)
         cameraSensor.attach(&localCamera->height);
         SoScale* localScaleNode = SO_GET_ANY_PART(this, "scaleNode", SoScale);
         localScaleNode->scaleFactor.disconnect();
-        autoScaleResult.disconnect(&draggerSize);
+        // This check shouldn't be needed but since CAM has its own
+        // ViewProvider classes that implement setEdit but doesn't inherit from
+        // ViewProviderDragger, we need to call Std_TransformManip twice.
+        // This causes setEditViewer to be called twice and Coin throws an error
+        // for trying to disconnect twice.
+        if (autoScaleResult.isConnectedFromField()) {
+            autoScaleResult.disconnect(&draggerSize);
+        }
         cameraCB(this, nullptr);
     }
     else if (cameraIn->getTypeId() == SoPerspectiveCamera::getClassTypeId()) {
@@ -498,7 +505,9 @@ void SoTransformDragger::setUpAutoScale(SoCamera* cameraIn)
         cameraSensor.attach(&localCamera->position);
         SoScale* localScaleNode = SO_GET_ANY_PART(this, "scaleNode", SoScale);
         localScaleNode->scaleFactor.disconnect();
-        autoScaleResult.disconnect(&draggerSize);
+        if (autoScaleResult.isConnectedFromField()) {
+            autoScaleResult.disconnect(&draggerSize);
+        }
         cameraCB(this, nullptr);
     }
 }

src/Mod/CAM/Path/Base/Gui/IconViewProvider.py

@@ -21,6 +21,7 @@
 # ***************************************************************************
 
 import FreeCAD
+import FreeCADGui
 import Path
 import importlib
 
@@ -83,10 +84,14 @@ class ViewProvider(object):
     def setEdit(self, vobj=None, mode=0):
         if 0 == mode:
             self._onEditCallback(True)
+        elif 1 == mode:
+            FreeCADGui.runCommand("Std_TransformManip")
+            return True
         return False
 
-    def unsetEdit(self, arg1, arg2):
-        self._onEditCallback(False)
+    def unsetEdit(self, vobj, mode):
+        if 0 == mode:
+            self._onEditCallback(False)
 
     def setupContextMenu(self, vobj, menu):
         Path.Log.track()