REGRESSION (r15617): white-space: pre-wrap breaks off the last character of a wide word

[I noticed this when looking at the test case for bug 13071]

The last character of the last word in white-space:pre-wrap that is too wide to fit gets wrapped to the next line. This regressed in <http://trac.webkit.org/projects/webkit/changeset/15617>.

Created attachment 13634 [details]
Test case

This is the change in r15617:

     if (lBreak == start && !lBreak.obj->isBR()) {
         // we just add as much as possible
-        if (style()->whiteSpace() == PRE) {
+        if (style()->preserveNewline()) {
             // FIXME: Don't really understand this case.
             if (pos != 0) {

And this is the explanation from the change log:

+        * rendering/bidi.cpp: (WebCore::RenderBlock::findNextLineBreak): Took a rule
+        that specifically called out the pre whitespace mode and made it work for all
+        the modes that preserve newlines. This makes sure we get a last line box for
+        text after the last "\n" even in cases where there is no <br> afterward.

I'm not sure that rule was about preserving newlines. I don't understand it either, but at least the (pos != 0) case seems wrong even for PRE.

Reverting the above change fixes the present bug and passes all layout tests.

[Dave Hyatt]

Attach a patch and I will r= this.

Created attachment 13638 [details]
Patch

[Dave Hyatt]

Comment on attachment 13638 [details]
Patch

My guess is this was just unintentional cleanup.

r=me

[Sam Weinig]

Landed in r20200.