Bug 197411 – [css-text] word-break: break-all must honor line breaking behavior introduced by characters with the GL character class

• Component: Text
• Status: RESOLVED DUPLICATE

[Javier Fernandez]

Created attachment 368552 [details]
Test case to reproduce the issue

What steps will reproduce the problem?
(1) Load the attached test case

What is the expected result?

The line is broken before the last letter 'X' "XXX|X&nbspXX|XX X|X" (see expected.png)

What happens instead?

The line is broken before the last letter 'X', "non-breakable" space character "XXXX|&nbspXXX|X X |X" (see actual.png)

[Javier Fernandez]

Created attachment 368553 [details]
Actual result

[Javier Fernandez]

Created attachment 368554 [details]
Expected result

[Javier Fernandez]

As it happened in the case reported in bug #197409, Firefox seems to implement the same behavior than us (I guess it has the same bug). 

However, Chrome and Edge implements what I think is the expected behavior, according to the CSS Text 3 specification:

https://drafts.csswg.org/css-text-3/#line-break-details

"Except where explicitly defined otherwise (e.g. for line-break: anywhere or overflow-wrap: anywhere) line breaking behavior defined for the WJ, ZW, GL, and ZWJ line-breaking classes in [UAX14] must be honored. "

[Jameela Huq]

In relation to this issue, Chrome and Firefox both break on Japanese periods and commas when "keep-all" is applied: e.g. In the sentence "情報も、スキルも、つながりも。あなたの仕事と未来を支えるSNS。" Chrome and Safari will break here [、。] however, on Safari, it will not break at all, which is very frustrating because "keep-all" is one of the few, reliable ways I have to break Japanese sentences appropriately   at the moment.

[Arcady Goldmints-Orlov]

This has been fixed by r288070 allowing LFC integration to work with the complex text path.

*** This bug has been marked as a duplicate of bug 235266 ***