D12551: Prevent invalid image array indexing

[Kurt Hindenburg]

hindenburg added a comment.


  Some of the konsole/tests/boxes.txt look much worse after this commit.  I tried various fonts.
  
  Single width, double, triple and quadruple dash.
  Double width, double, triple and quadruple dash.

REPOSITORY
  R319 Konsole

REVISION DETAIL
  https://phabricator.kde.org/D12551

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