Add attribute 'visible' to BasicScanWorkflowDrawer

Signed-off-by: Jerome Flesch <[email protected]>

Author: jflesch

src/paperwork/frontend/mainwindow/scan.py

@@ -393,6 +393,8 @@ class BasicScanWorkflowDrawer(Animation):
 
     layer = Animation.IMG_LAYER
 
+    visible = True
+
     def __init__(self, scan_workflow, page=None, previous_drawer=None):
         Animation.__init__(self)