Original window focus when opening IDLE by double clicking Python file Mac

GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2020-01-14.01:24:01.282>
labels = ['OS-mac', 'expert-IDLE', 'type-bug', '3.7']
title = 'Original window focus when opening IDLE by double clicking Python file Mac'
updated_at = <Date 2020-06-05.02:37:17.430>
user = 'https://github.com/IrvKalb'

bugs.python.org fields:

activity = <Date 2020-06-05.02:37:17.430>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE', 'macOS']
creation = <Date 2020-01-14.01:24:01.282>
creator = 'IrvKalb'
dependencies = []
files = []
hgrepos = []
issue_num = 39325
keywords = []
message_count = 5.0
messages = ['359942', '365181', '365185', '365188', '370747']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'ronaldoussoren', 'ned.deily', 'IrvKalb']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39325'
versions = ['Python 3.7']