fix doIfAlive Api - do not check if lt is alive, it can potentially block us on the spinlock, but makes no sense

avoid expensive PSI copying in completion when the dummy identifier is empty, use this to speed up word completion

add more explaining, warnings and justifications on mySegment is special-cased to null in NULL_FILE (IDEA-CR-46034)

Java: Use 'enum' keyword for enums in quick doc. Don't show 'final' and 'static' in that case - JLS 8.9 (IDEA-175215)

PY-35103 Running "pycharm.bat" complains "cannot find VM options file" if the custom VM options file was created

[groovy] check if groovy file is inside sources before checking if `Field` identifier is in this file (IDEA-211117)

There are no indexes for files outside source roots and `#hasIdentifierInFile` always returns `false`.