D18735: Improve built-in line/box characters drawing

[Mariusz Glebocki]

mglb marked an inline comment as done.

REPOSITORY
  R319 Konsole

REVISION DETAIL
  https://phabricator.kde.org/D18735

To: mglb, #konsole, #vdg, fvogt
Cc: sandsmark, fvogt, konsole-devel, maciejn, thsurrel, ngraham, maximilianocuria, hindenburg
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