question: public static void finishPsiModification ( ) { if ( ! PsiInvalidElementAccessException . isTrackingInvalidation ( ) ) { return ; } Integer depth = ourPsiModificationDepth . get ( ) ; if ( depth == null ) { LOG . warn ( "Unmatched PSI modification end" , new Throwable ( ) ) ; depth = 0 ; } else { depth -- ; ourPsiModificationDepth . set ( depth ) ; } if ( depth == 0 ) { ourPsiModificationTrace . set ( null ) ; } }
target:  Finished PSI modification action.