question: @ Nullable public Dimension adjust ( @ NotNull Dimension newPreferredSize , @ Nullable Dimension oldPreferredSize , @ NotNull EditorImpl editor ) { if ( oldPreferredSize == null || mySkip ) { return newPreferredSize ; } if ( newPreferredSize . height != oldPreferredSize . height ) { return newPreferredSize ; } stripTimings ( ) ; myTimings . add ( System . currentTimeMillis ( ) ) ; if ( myTimings . size ( ) < FREQUENT_SIZE_CHANGES_NUMBER ) { return newPreferredSize ; } boolean increaseWidth = newPreferredSize . width > oldPreferredSize . width ; Dimension result ; if ( increaseWidth ) { final int spaceWidth = EditorUtil . getSpaceWidth ( Font . PLAIN , editor ) ; newPreferredSize . width += myReserveColumns * spaceWidth ; myReserveColumns += 3 ; result = newPreferredSize ; } else { result = oldPreferredSize ; } scheduleSizeUpdate ( editor ) ; return result ; }
target:  Asks to adjust new preferred size appliance if necessary.