I've left a complain about this problem in
ko:위키백과:사랑방 (기술)/2017년 2월#시각편집기 잘못된 찾기 기능 . I want to use changing tool safely, because of this bug, this tool may cause vandalism. But, more thing that is interesting is this bug only affects in same articles. I've re-started the computer and turned it back on and still. And one of the user said that it affects in some browsers. I use Google Chrome. Can anyone reply this? Thanks. Jerrykim306 (talk) 11:06, 2 March 2017 (UTC)
If I go to https://ko.wikipedia.org/wiki/2013%EB%85%84_%ED%84%B0%ED%82%A4_%EB%B0%98%EC%A0%95%EB%B6%80_%EC%8B%9C%EC%9C%84?action=edit , and look for "Gezi", looks like the occurrences are found in the text, but they are not highlighted correctly (highlighting starts or ends close to the word, but doesn't just include it). Is this the problem? (I'm curious how this can cause vandalism though.)
Answering Is this the problem? and the answer is Yes. Because, if I use switch tool(Clicking on the white button which replaces highlighted), it will change in a same position where is highlighted not correctly. Jerrykim306 (talk) 11:17, 2 March 2017 (UTC)
Now at https://phabricator.wikimedia.org/T159439, thanks for reporting here.