Empty line didn't show Numbered or Bulleted

[oobot]

On an empty line, use NumberSpan or BulletedSpan doesn't work(accurate the span is exists, but didn't show)

[1gravity]

This is because Android simply doesn't draw BulletSpans for an empty line. Feel free to investigate and find a workaround. I'm happy about any pull requests for this.

[kim1059]

i know that zero width char will help. what do you think?

[1gravity]

did you test it?

[kim1059]

fixed here: #117