psf / black / 2074

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Improve docstring re-indentation handling

This addresses a few crashers, namely:

* producing non-equivalent code due to mangling escaped newlines,

* invalid hugging quote characters in the docstring body to the docstring outer
  triple quotes (causing a quadruple quote which is a syntax error),

* lack of handling for docstrings that start on the same line as the `def`, and

* invalid stripping of outer triple quotes when the docstring contained
  a string prefix.

As a bonus, tests now also run when string normalization is disabled.

25 of 25 new or added lines in 2 files covered. (100.0%)

4708 of 4935 relevant lines covered (95.4%)

3.81 hits per line