pdb's debug command (Pdb.do_debug) doesn't use rawinput even if the parent pdb uses rawinput

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-07-29.21:02:07.920>
labels = ['3.7', '3.8', 'type-bug', 'library', '3.9']
title = "pdb's debug command (Pdb.do_debug) doesn't use rawinput even if the parent pdb uses rawinput"
updated_at = <Date 2019-05-16.10:35:56.076>
user = 'https://github.com/segevfiner'

bugs.python.org fields:

activity = <Date 2019-05-16.10:35:56.076>
actor = 'blueyed'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-07-29.21:02:07.920>
creator = 'Segev Finer'
dependencies = []
files = []
hgrepos = []
issue_num = 31078
keywords = []
message_count = 5.0
messages = ['299485', '336770', '342634', '342635', '342637']
nosy_count = 2.0
nosy_names = ['blueyed', 'Segev Finer']
pr_nums = ['2947']
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31078'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9']