code: private boolean canStepInCaptureTo(List<StackLine> stackLines) {
          // stack bottom line ( = root line) is always regarded as stepIn true line
          for (int i = 0; i < stackLines.size() - 1; i++) {
              StackLine stackLine = stackLines.get(i);
              CaptureStyle style = stackLine.getMethod().getCaptureStyle();
              if (style != CaptureStyle.STEP_IN && style != CaptureStyle.STEP_IN_ONLY) {
                  return false;
              }
          }
          return true;
      }
docs: if method is called from not stepInCapture line, then returns false.