Add drawable-interline-spacing

[hannanilsson]

Hi again! August came early this year 😅

We wanted to add the possibility to use interline-spacing, however, negative values does not seem to work. We are unable to understand why. Could you maybe have a look? Thank you!

[dlemstra]

Thanks for coming back so quickly to help me with this project. Would you be willing to change this PR and remove the negative value unit test? I can then merge this and investigate why the negative value is not working. It seems to be working on the command line so it should work in wasm.

[hannanilsson]

Absolutely, I have removed it now! We just wanted to add it initially to demonstrate the issue. It sounds promising that it should work with negative values, hope your investigation can find why it doesn't! 😄

[dlemstra]

Thanks for adding the test for a negative value earlier. I have found what was causing it not to work and fixed the issue in ImageMagick. This will be fixed when I upgrade Magick.Native later this week. And then I will also add a unit test for a negative value.

[hannanilsson]

Glad to hear that! Thank you for your work! ⭐️