Christian Duerr 1cebcd660b

Fix rendering of zero-width characters ...

Instead of rendering zero-width characters as full characters, they are
now properly rendered without advancing the cursor.

Because of performance limitations, this implementation only supports up
to 5 zero-width characters per cell. However, as a result of this
limitation there should not be any performance impact.

This fixes #1317, fixes #696 and closes #1318.

2018-12-09 15:28:22 +00:00

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