[a1369209993]

Yeah, this is purely a issue of poor support for box drawing characters by the font.

Eg, I get:

  data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAhAAAABQAQMAAAByCd6PAAAABlBM
  VEX///8AAABVwtN+AAABc0lEQVRYw+2YwWrEIBCGR5EyhR6k5LCHsvUx9iQ6t30n6dL3LmxnHDdx
  IadmoUtwAr/5M+OHRIUYgKeLJPKSlnvWBCu21yU8wJQgXuJrVRTFKH3YxdaoxUtXkiYIITAAKyJA
  Tvm16kn0lANUl1ujVh7PJYzw3s+jCGBSxkXRSB92pjVq5fFcwghEhFIOpQBNnmw6x6ooisaX6gxo
  oxZtV1ImcM4BEZIH4jr3JZmb4tFTdUdNNYuuKyEAa+2MQEJzxkX5ouqMpprFvoQR/ShYa+amivCK
  8A3hK2IuYYS8C0qKcBRMxkXROKrOaKpZ7EsYITMiiPeK4InDRTFLH3ZZU81iX8IIWRclRXqDCFaW
  z6FqbErawp3FrqTA3Uq1K2phxfYKq4v9r9trxH7i8/qzD8QHXwMxEAMxEAMxEAPxFIjdfF+M2Glc
  tyO+94CQc+pGhJyWNyLkzL4RIX8ONiLk/8X/j+IB7+IBM/KAdfE8e2TbZv8FgJZ8r2PE1j8AAAAA
  SUVORK5CYII=

Edit: how do I force HN to turn URLs into links? It usually does that automatically. Code-blocked for now.

[Pinus]

Is there a way for a font to "know" at what line spacing it is being rendered?

[rzzzt]

I don't think it is controllable by the font; the only issue I can see if these lines and corners are not extended all the way to each character cell's bounding box.