Currently, there is space processing in the preparation and in the line construction. Do both essentially do the same thing, but we need to redo it for the line because of reshaping?

Do both essentially do the same thing, but we need to redo it for the line because of reshaping?

No, they are doing different things. The diff is a little hard to reason about, because it mixed some adjustments that we already have with the newly added adjustments.

Currently we have following CJK-related adjustments:

• a. The shrinkability of punctuation marks is added in preparation.
• b. The width of two consecutive punctuation marks is adjusted in preparation.
• c. Punctuation in line begin and end need additional adjustment. We do that in line construction.

In this PR, two more adjustment is added:

• d. Spacing is added between two consecutive CJK and Latin characters in preparation.
• e. But we do not want to add spacing to line begin and end. We do not know if it is the case until line construction. So we undo the above adjustment for line end in line construction.

Note that adjustment c. and e. happens in the same place in par::line function, and I added some comments for adjustment c., though it has actually added by previous PR #954 .

Doesn't that mean that all adjustments that are only done in preparation are potentially lost if we need to reshape a segment containing such adjustments?

Doesn't that mean that all adjustments that are only done in preparation are potentially lost if we need to reshape a segment containing such adjustments?

No. There is no ligature in CJK scripts, so AFAIK its always safe to break around CJK character. So the glyphs will always be reused and no adjustment will lose.

* "CJK" has multiple meanings. Here (and in typst), I am referring to the Han, Hiragana, and Katakana scripts, not Hangul.

Thank you!