[processing] behavior of scroll zoom in the modeler

Zooming shouldn't recenter the scene on the cursor, only scale the scene
around it.

Author: HenningJagd

python/plugins/processing/modeler/ModelerDialog.py

@@ -106,7 +106,6 @@ def _wheelEvent(event):
             if event.delta() > 0:
                 factor = 1/factor
             self.view.scale(factor, factor)
-            self.view.centerOn(event.pos().x(), event.pos().y())
             self.repaintModel()
 
         def _enterEvent(e):