In the 'IGNORE_SELF' mode, dangling files don't have their own
declarations in providers. As a result, all references there resolve to
declarations of the original file. It is conceptually similar to that we
had in on-air resolve, however, now it's possible to work with the whole
content of the in-memory 'FirFile'.
As it can be seen in 'ProjectStructureProvider.kt'
(KtFile.danglingFileResolutionMode), the 'IGNORE_SELF' mode is
automatically applied for non-physical files with an original file being
set. For other scenarios, now there is a new 'analyzeCopy()' function
that allows to pass the analysis mode explicitly.
Yan Zhulanow
452d22e14f