This commit fixes test infrastructure issue.
Usage of "COMPILER_ARGUMENTS" test-data-instruction resulted in side
effect. Test cases following the one that used it got broken
LanguageVersionSetting - LanguageFeature.MultiPlatformProjects escaped,
languageVersion could be wrong.
Why it happened
KotlinProjectDescriptorWithFacet defines default values
of (language-version, isMultiplatform) settings for the test-case.
The values themselves are stored in KotlinFacetSettings and passed there
only once. After every test-case (if it uses "COMPILER_ARGUMENTS")
infrastructure calls
KotlinLightCodeInsightFixtureTestCaseKt#rollbackCompilerOptions which
resets mentioned values (among others) in KotlinFacetSettings.
Instances of KotlinProjectDescriptorWithFacet are reused hence facet
settings remained reset.
Andrei Klunnyi
27ebb6c946