Typst currently support breaking a paragraph into several consecutive lines in source code, without introduce a newline in result PDF. The single newline in source code will just become a space. However, when working with scripts that do not using spaces between words, like Chinese and Japanese, we often not want to have the newline, nor the space.

In a paragraph like this:

中文
测试

In Chinese context, the most sensible result is 中文测试, without any spaces and newlines.

I propose implementing the following features in typst:

1. Eliminate spaces between CJK characters in source code.
2. Let trailing comment consume a linebreak in source code.
   This is because sometimes we have a inline frame and CJK detect will not work, so we need an opt-in method. I think the changed behavior can be minimal, comments will consume new line only if it has no space before it.
   For example, this code

   abc //
   def
   

   becomes abc def
   and

   abc//
   def
   

   becomes abcdef.
   Latin users often use the former one so they will not be affected.