Although I don't find regression range yet, candidate window is always located at first character instead of composing character. Patch is coming soon.

TargetClauseOffset is the offset from start composition offset. So we should add start composition to calaculate correct rects. Review commit: https://reviewboard.mozilla.org/r/64172/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/64172/

This seems to be regression by bug 1137565

Comment on attachment 8770842 [details] Bug 1286753 - Candidate window should be located under composing string. https://reviewboard.mozilla.org/r/64172/#review61232 Good catch! We should uplift this. # Sorry, I forgot to publish this...

Pushed by m_kato@ga2.so-net.ne.jp: https://hg.mozilla.org/integration/autoland/rev/12217312864d Candidate window should be located under composing string. r=masayuki

[Tracking Requested - why for this release]: This is regression from firefox 48. This issue influences all IME user's usability on Linux.

Comment on attachment 8770842 [details] Bug 1286753 - Candidate window should be located under composing string. Approval Request Comment [Feature/regressing bug #]: Bug 1137565 [User impact if declined]: When using IME for CJK on Linux, candidate window by IME isn't located at correct position. [Describe test coverage new/current, TreeHerder]: Landed in m-c. And I verified on multiple Linux distributions (Ubuntu 14.04, 16.04, Fedora 24, and Debian/sid) [Risks and why]: Low. Set candidate window to correct position only. [String/UUID change made/needed]: No

Comment on attachment 8770842 [details] Bug 1286753 - Candidate window should be located under composing string. This patch fixes a regression which sets candidate window by IME to correct position. Take it in 48 beta 10 and aurora.

This also needs to be verified in beta.

Tracking because we care about our IME users

Reproduced on 48b9 with Chinese Pinyin, Ubuntu 14.04. Verified fixed FX 48b10, 49.0a2 (2016-07-25), 50.0a1 (2016-07-25) Ubuntu 14.04.