Rule request

Thesis

Detect if both possible results of a ternary operator return the same value.

# bad
# (all results below can be replaced by just `a`)
a if ... else a
a if a is not None else None
a if a != b else b
b if a == b else a

# ok
a if ... else c
a.split() if a is not None else None
a if a != b else c

Reasoning

It is either a bug or unnec

A really simple task. The best first issue. We have a huge lack of tests. Write tests for anything inside, be creative 🔥

Given the number of tools officially supported(tested) by nbqa is increasing with every release, should we create a separate section in the documentation to document usage of each tool supported by nbqa with some elaborate examples and recommended setting against each tool.

Suggestions are welcome!