[Open] rename COLON3 to COLON2_HEAD

Issue #10287 has been reported by yasuhiro arima.


misc #10287: rename COLON3 to COLON2_HEAD.

  • Author: yasuhiro arima
  • Status: Open
  • Priority: Normal
  • Assignee:
  • Category: core
  • Target version: current: 2.2.0