getNthAncestor.
Fix stupid bug.
Move prototype to MixinUtils.
Link mixins to best match.
Cache mixin prototypes.
Fix indent.
Delete calls to non public methods.
Create class LessMixinLinkingHelper.
Move LessLinkingService.
Fix bug.
Create LessMixinScopeProvider.
Public interface of LessMixinScopeProvider.
Refactor LessScopeProvider, using LessMixinScopeProvider.
Minor fixes.
Add documentation.
Add documentation.
Fix serialization.
Add some documentation.
MixinContext.
Make completion proposal to work.