D25339: KateRenderer: Use representitive character in CJK to estimate the fontHeight.

[Xuetian Weng]

xuetianweng added reviewers: cullmann, dhaumann.

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D25339

To: xuetianweng, #ktexteditor, cullmann, dhaumann
Cc: kde-frameworks-devel, kwrite-devel, LeGast00n, GB_2, domson, michaelh, 
ngraham, bruns, demsking, cullmann, sars, dhaumann