I have attached a minimal example. The size part works using Window.size, stumbled across that, but cannot find any actual documentation for it.
Cannot figure out the position part. Trying to use "self.root_window.top" causes an Exception:
File "/home/jra/PycharmProjects/SizeAndLocationPlay/main.py", line 62, in on_stop
print('top = ' + str(self.root_window.top) + '\n')
File "kivy/properties.pyx", line 483, in kivy.properties.Property.__get__ (/tmp/pip-build-vf10dxpy/kivy/kivy/properties.c:5670)
File "kivy/properties.pyx", line 1467, in kivy.properties.AliasProperty.get (/tmp/pip-build-vf10dxpy/kivy/kivy/properties.c:23970)
File "/usr/local/lib/python3.6/site-packages/kivy/core/window/__init__.py", line 752, in _get_top
return self._get_window_pos()[1]
TypeError: 'NoneType' object is not subscriptable
The ini file contains a "top" and "left" in the "graphics" section, but they seem to just be copies from the systemwide kivy Config. Changing those values in the ini file seems to have no effect.