Bug 11671 – REGRESSION (r13702): text-transform: capitalize changes non-breaking spaces to spaces

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[Split off from bug 11630, where this was not the main issue]

The testcase (attachment 11590 [details]) demonstrates that text-transform:capitalize changes non-breaking spaces to normal spaces. In shipping Safari, Firefox and Opera, there is a gap between the two 100x100 squares due to the text, which includes non-breaking spaces. This is also the case in TOT if text-transform: capitalize is not specified.

From StringImpl::capitalize:
        // Replace &nbsp with a real space since ICU no longer treats &nbsp as
a word separator.

This was added in r13702 to address <rdar://problem/4502311>
text-transform:capitalize needs to 
treat nbsp as a regular space when ICU changes.

I think the solution might be as simple as copying from m_data[i - 1] instead
of stringWithPrevious[i] in the loop that copies the non-capitalized
characters.

Created attachment 12033 [details]
Preserve non-breaking spaces when capitalizing

Includes test and change log. No layout test regressions.

Created attachment 12044 [details]
Preserve non-breaking spaces when capitalizing

This version also improves the fix for <rdar://problem/4502311> from r13702 by applying it to 'previous'. A test for the case that the previous character is a non-breaking space is included, although with current ICU, this patch does not affect this case.

[Alexey Proskuryakov]

Comment on attachment 12044 [details]
Preserve non-breaking spaces when capitalizing

r=me

As discussed on IRC, it would be nice to know more about what happened to nbsp in the new Unicode standard (I don't understand why it stops being a word separator), but that's outside the scope of this bug.

[Alexey Proskuryakov]

I'm not sure if the whole hack with replacing nbsps is necessary anymore, given that Unicode 5 has restored their behavior of word separators. This fix seems good to land anyway.

[Alexey Proskuryakov]

Committed revision 18453. Corrected expected results (the patch had old pixel results).