remove unused PsiFileImpl#HARD_REFERENCE_TO_DOCUMENT
[^ilya] a more formal definition of Contract.pure
IDEA-128906 PsiInvalidElementAccessException in EditorTextField
when a loaded file becomes too large, don't load its new contents to the memory
IDEA-128012 New Project Wizard Groovy Facet - all items not properly dithered out
CPP-618 Add possibility to run CLion as desktop app on Ubuntu