textwrap: placeholder backtracking special case lacks test coverage

[jonathaneunice]

BPO	30591
Nosy	@serhiy-storchaka, @jonathaneunice
PRs	bpo-30591: added test for textwrap backtracking #1988 bpo-30620: remove bogus/dead lines from dedent #2064

^{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 = None
closed_at = <Date 2017-06-07.20:51:14.622>
created_at = <Date 2017-06-07.16:40:44.785>
labels = ['3.7', 'type-feature', 'tests']
title = 'textwrap: placeholder backtracking special case lacks test coverage'
updated_at = <Date 2017-06-10.04:17:35.490>
user = 'https://github.com/jonathaneunice'

bugs.python.org fields:

activity = <Date 2017-06-10.04:17:35.490>
actor = 'jonathaneunice'
assignee = 'none'
closed = True
closed_date = <Date 2017-06-07.20:51:14.622>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2017-06-07.16:40:44.785>
creator = 'jonathaneunice'
dependencies = []
files = []
hgrepos = []
issue_num = 30591
keywords = []
message_count = 2.0
messages = ['295354', '295368']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'jonathaneunice']
pr_nums = ['1988', '2064']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30591'
versions = ['Python 3.7']

[jonathaneunice]

A rare case in textwrap when max_lines insufficient and textwrap needs to backtrack to a previous line to add the placeholder seems to lack test coverage.

This issue added as prereq for suggesting an additional test. PR imminent.

Code: Lib/textwrap.py (as is)
Test: Lib/test/test_textwrap.py (extended)

[serhiy-storchaka]

New changeset 5edf827 by Serhiy Storchaka (Jonathan Eunice) in branch 'master':
bpo-30591: Added test for textwrap backtracking. (bpo-1988)
5edf827