Code snippet misses line numbers and messes indentation up

[dom9]

Trying to convert the Swift 4.0 guide to read on paper.
The whole thing looks beautifully but the code snippets are off

The last random amount of line numbers isn't printed and the actual lines are always off indentation. Since the book is a programming book, it consists mostly of code snippets, so this small bug makes the whole things unprintable.

How do I fix this?

Here's an example snippet https://imgur.com/a/1TQ9G

PS: I am using the latest Calibre 3.9.0 on macOS High Sierra

[kovidgoyal]

https://www.mobileread.com/forums/sho...d.php?t=186697

[dom9]

Thank you for your reply, Kovid. Hope this will help:

1. eBook: https://swift.org/documentation/TheS...e(Swift4).epub
2. Calibre Log: https://pastebin.com/LVZmn3EW
3. Translated File: https://www.dropbox.com/s/bpamen9oht...0Inc_.pdf?dl=0
4. Issue: Random last lines of snippets of code lose indentation and numbering.
5. Changed from default options: Only fonts and font sizes. You can find all of em here: https://www.dropbox.com/s/wks19puodv...0opts.png?dl=0

[kovidgoyal]

Nothing random about it, its basically caused by a hack the CSS in that book uses that breaks when font sizes are rescaled. You can either disable font size rescaling in the conversion or open up the book with the calibre editor and edit epub.css removing the rule:

/* fix for double-digit code listing numbers */
#conceptual_flow_with_tasks .code-lines li:nth-child(n+10) {
  text-indent: -6.55em;
}

Basically the CSS in that book uses a mixture of rem and em units for different things, that does not play well with font size rescaling.