[Legacy Line Layout] Incorrect hanging glyph handling with white-space: pre-wrap

• Component: Text
• Status: RESOLVED CONFIGURATION CHANGED

Created attachment 423412 [details]
An HTML file with two one-line paragraphs of text containing leading and trailing whitespace.

According to https://www.w3.org/TR/css-text-3/#collapse:

> If white-space is set to pre, pre-wrap, or break-spaces, any sequence of spaces is treated as a sequence of non-breaking spaces.

This seems to be the case in Safari 14 for left-aligned paragraphs. But not 

But for for a text element with leading and trailing spaces, text renders like the following (with spaces represented as "_"):

+---------------+
|__text__       |
+---------------+


But right-aligned text renders like:

+---------------+
|         __text|
+---------------+

where the trailing spaces are collapsed.

Attached is an HTML file that demonstrates this.

[Radar WebKit Bug Importer]

<rdar://problem/75760533>

[zalan]

With the outline removed, IFC (modern line layout) renders the attached test case fine (atm the outline property forces us on the legacy codepath).

[Ahmad Saleem]

@Alan - since now IFC is default, is it something we can close? Or we are still falling back on legacy for this outline case?

[zalan]

(In reply to Ahmad Saleem from comment #3)
> @Alan - since now IFC is default, is it something we can close? Or we are
> still falling back on legacy for this outline case?
There's no such thing as fallback anymore. This progressed with IFC "long" time ago.