IDEA-19619 (highlight invalid for init statements)
nonmodal error notification about our inability to copy jar file (IDEA-105502), it is ok since IDEA can live without it
also extracted FS_RESOLUTION constant of 2s
clean id 2 directory cache on low memory - observing com.intellij.util.containers.StripedLockIntObjectConcurrentHashMap$IntHashEntry[524288] - 7503576 after opening 5 idea branches
processQueue on low memory: we can get light virtual file 2 psi invalidation upon indexing cancellation, if the file is large (e.g. 20M javascript) then it is important to clean even virtual file key.
cache jars based on sha1 signature
protect myCache access with lock, as in other usages