GitLab

The CSS Text 3 specification states on its 'Phase II: Trimming and
Positioning' section:

https://www.w3.org/TR/css-text-3/#white-space-phase-2

3- A sequence at the end of a line of collapsible spaces is removed, as
well as any trailing U+1680 OGHAM SPACE MARK whose white-space property
is normal, nowrap, or pre-line.

4- If there remains any sequence of white space and/or and/or other space
separators, at the end of a line: If white-space is set to pre-wrap, the
UA must hang this sequence. It may also visually collapse the character
advance widths of any that would otherwise overflow.

Summarizing, other space separator are not considered as collapsible
spaces and should be hang, or broken in case of 'break-spaces', according
to the value of the 'white-space' property.

This CL tries to implement such behavior, since we were not considering
this kind of spaces in the hanging/collapsing logic.

For now this change affects LayoutNG only, but it'll be implemented for
Legacy in a different CL.

Bug: 972952
Change-Id: Idb0aff05f7f423f5b62f5169177c0240917435a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1687411Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Javier Fernandez <jfernandez@igalia.com>
Cr-Commit-Position: refs/heads/master@{#824597}