IDLE: Make PyShell visible upon error.

[terryjreedy]

BPO	30719
Nosy	@terryjreedy

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2017-06-20.23:35:40.756>
labels = ['expert-IDLE', 'type-feature', '3.10']
title = 'IDLE: Make PyShell visible upon error.'
updated_at = <Date 2020-06-07.21:58:30.153>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2020-06-07.21:58:30.153>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2017-06-20.23:35:40.756>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 30719
keywords = []
message_count = 2.0
messages = ['296500', '296501']
nosy_count = 1.0
nosy_names = ['terry.reedy']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30719'
versions = ['Python 3.10']

[terryjreedy]

Spinoff from bpo-10079. "PseudoStderrFile" in PyShell.py brings the shell forward if an error occurs. It should be possible to extract G. Polo's patch for that class from the megapatch.

A possible issue is that PseudoStdoutFile and PseudoStderrFile have been combined as PseudoOutputFile. That and PseudoInputfile are used in both the IDLE and user processes.

[terryjreedy]

The lift action should only happen in the IDLE GUI process. When I retrace the data flow, I should document it.