PyUnicode_FromFormatV: support width and precision for string codes, e.g %S and %R

[akheron]

BPO	13428
Nosy	@vstinner, @akheron

^{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 2011-11-18.12:03:21.118>
created_at = <Date 2011-11-18.11:58:54.543>
labels = ['interpreter-core', 'type-feature']
title = 'PyUnicode_FromFormatV: support width and precision for string codes, e.g %S and %R'
updated_at = <Date 2011-11-18.12:03:21.117>
user = 'https://github.com/akheron'

bugs.python.org fields:

activity = <Date 2011-11-18.12:03:21.117>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2011-11-18.12:03:21.118>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2011-11-18.11:58:54.543>
creator = 'petri.lehtinen'
dependencies = []
files = []
hgrepos = []
issue_num = 13428
keywords = []
message_count = 2.0
messages = ['147858', '147860']
nosy_count = 2.0
nosy_names = ['vstinner', 'petri.lehtinen']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue13428'
versions = ['Python 3.3']

[akheron]

Currently, the width and precision information for string codes are accepted but ignored. They should be used to pad short strings (width) and truncate long ones (precision), just like printf() (only in terms of code points rather than bytes, since those codes work with Unicode text).

[vstinner]

Duplicate of bpo-7330.