WEB-9076 Dart: error if map key is a constant
WEB-8264 Proper syntax with List literal is flagged as error.
WEB-8117 Dart plugin - member-variable case (in switch) is formatted weirdly
WEB-7218 Dart: Refactor/Rename doesn't work for function passed as argument
WEB-7217 Dart: formatter breaks the cascade operation
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WEB-1536 Dart formatter: cascade operation should be indented 4 spaces
Dart: fixed tests