From 9daeba94d2fae8fe2663a953aa1f5242bb5d2f62 Mon Sep 17 00:00:00 2001
From: David Bridges <david-bridges@hotmail.co.uk>
Date: Fri, 13 Sep 2019 12:10:16 +0100
Subject: [PATCH] BF: Disable the Form aperture on creation, enable only on
 draw

This fix stops the aperture from being drawn when the Form is created.
This was causing the aperture to persist over all routines, until the
Form was actually drawn, where the aperture could be disabled.
---
 psychopy/visual/form.py | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/psychopy/visual/form.py b/psychopy/visual/form.py
index 77965702a3..a33968b815 100644
--- a/psychopy/visual/form.py
+++ b/psychopy/visual/form.py
@@ -596,13 +596,15 @@ def _setAperture(self):
         psychopy.visual.Aperture
             The aperture setting viewable area for forms
         """
-        return psychopy.visual.Aperture(win=self.win,
-                                        name='aperture',
-                                        units=self.units,
-                                        shape='square',
-                                        size=self.size,
-                                        pos=(0, 0),
-                                        autoLog=False)
+        aperture = psychopy.visual.Aperture(win=self.win,
+                                            name='aperture',
+                                            units=self.units,
+                                            shape='square',
+                                            size=self.size,
+                                            pos=(0, 0),
+                                            autoLog=False)
+        aperture.disable()  # Disable on creation. Only enable on draw.
+        return aperture
 
     def _getScrollOffset(self):
         """Calculate offset position of items in relation to markerPos