vwvww 1c30442333 servo: Merge #15690 - Add 'use statements with extraneous spaces' tidy check (from vwvww:issue_14898); r=Wafflespeanut
Add 'use statements with extraneous spaces' tidy check

I added simple check routine for 'use statements with extraneous
spaces' and codes that breaks the check routine in rust_tidy.rs.

* Added a code that using 'use statements with extraneous spaces' code
  in rust_tidy.rs
* Added assertion code in test_tidy.py.
* check_rust function in tidy.py now recognizes the simple case in
  the 'use statements with extraneous spaces'.
* Ran tidy check on rust code and modified a
  code(tests/unit/style/parsing/inherited_text.rs) that is not passing
  on this new tidy check.

TODO: this code has to be refactored to support more general cases, such as tab or newline.

- [X] `./mach build -d` does not report any errors
- [X] ./mach test-tidy does not report any errors
- [X] These changes fix #14898 (github issue number if applicable).
- [X] These changes do not require tests because ./mach test-tidy itself is the test for the code.

Source-Repo: https://github.com/servo/servo
Source-Revision: b34fdf62341a01abb8da021f07071c5eb8b06622

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 7785f02199a3c54165b88801a7e7abdaec43b78e
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