graphql / graphql-js / 3087

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Improve dedent (fixes #1202) (#1203)

* Improve dedent utility tag function used for tests

Changed the behavior of the function to not have the undocumented side
effect of converting the string to its escaped (raw) form any more,
and to also consider tabs in addition to spaces.

Also added unit tests for the dedent function and adapted existing
tests that were depending on the old behavior of the function.

* Show test output as printed, avoid double backslash

* Test that dedent properly supports interpolation

* Make expected output in dedent-test easier to read

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