1341198 - String doesn't break on all hyphens

Status: RESOLVED DUPLICATE of bug 809020

(Core :: Layout: Text and Fonts, defect)

Description

[Albert Scheiner [:alberts]]

Attachment: ff-hyphen-wrapping.mp4

I have a string with two hyphens. When reducing the width of the browser window, i.e. by using RDM, the string only wraps on the second hyphen ones hitting the window width. The first hyphen never wraps and a vertical scrollbar appears.

I have created a pen and a screencast to demonstrate the issue. The first string works as expected, the second string - which is closer to my original string - for some reason doesn't.

Codepen:
http://codepen.io/scheinercc/pen/PWMzeW

Comment 1

[Jonathan Kew [:jfkthame]]

This is a known issue; we don't break if the hyphen is less than 6 chars from the edge of the word, because of the "conservative breaking" here:

https://dxr.mozilla.org/mozilla-central/rev/d0462b0948e0b1147dcce615bddcc46379bdadb2/intl/lwbrk/nsJISx4051LineBreaker.cpp#624-632

I think we really need to reconsider that code. Maybe ignore the 6-char "conservative zone" depending on the category or script of the adjacent characters.

Comment 2

[Albert Scheiner [:alberts]]

Thanks for clarifying. Weird behaviour IMHO, and not obvious at all. We now had to make the font size smaller (for all browser) in order to make the not wrapping text fit into the container, though I first was looking for errors in the code. Only after all other browsers were wrapping as expected I filed this bug.