D15758: Use new character width code based on Unicode 11

[Mariusz Glebocki]

mglb marked an inline comment as done.

REVISION DETAIL
  https://phabricator.kde.org/D15758

To: mglb, #konsole, #vdg
Cc: broulik, ngraham, konsole-devel, herrold, maximilianocuria, hindenburg
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