IDEA-106730 Java completion: 'instanceof' is not suggested if an operand is unresolved
an assertion for uncoupled before/after vfs events
dfa: method can still return unknown value if its arguments satisfy nullity conditions (IDEA-106205)
per CR-IC-909: remove synchronized from LinkedHashSetWrapper.add
when running ant target from IDEA, set "ant.library.dir" built-in property which is usually set by ant's Launcher class (similar to "ant.home" property)
add -ea for plugins configuration (IDEA-106609)
strip wildcards when prepare explicit generics types to qualify the method calls (IDEA-106741)
Merge remote-tracking branch 'origin/master'
fix compilation