Cherry-pick 2c41110. rdar://122811940

    [IFC][Ruby] Ruby base content may wrap even when style says no
    https://bugs.webkit.org/show_bug.cgi?id=269235
    <rdar://122811940>

    Reviewed by Antti Koivisto.

    There's no soft wrap opportunity between 2 adjacent non-whitespace characters when style says nowrap.

    * LayoutTests/fast/ruby/ruby-base-content-should-not-wrap-expected.html: Added.
    * LayoutTests/fast/ruby/ruby-base-content-should-not-wrap.html: Added.
    * Source/WebCore/layout/formattingContexts/inline/InlineFormattingUtils.cpp:
    (WebCore::Layout::isAtSoftWrapOpportunity):

    Canonical link: https://commits.webkit.org/272448.537@safari-7618-branch

Identifier: 272448.559@safari-7618.1.15.10-branch

LayoutTests/fast/ruby/ruby-base-content-should-not-wrap-expected.html

@@ -0,0 +1,11 @@
+<meta charset="UTF-8">
+<style>
+div {
+  font-family: Ahem;
+  font-size: 20px;
+  width: 40px;
+  border: 1px solid green;
+  overflow: hidden;
+}
+</style>
+<div>X <ruby>稲稲</ruby></div>

LayoutTests/fast/ruby/ruby-base-content-should-not-wrap.html

@@ -0,0 +1,12 @@
+<meta charset="UTF-8">
+<style>
+div {
+  font-family: Ahem;
+  font-size: 20px;
+  width: 40px;
+  border: 1px solid green;
+  overflow: hidden;
+}
+</style>
+<!-- while there's a natural breaking position between 稲 and 稲, nowrap should prevent wrapping -->
+<div>X <ruby>稲稲</ruby>,X</div>

Source/WebCore/layout/formattingContexts/inline/InlineFormattingUtils.cpp

@@ -402,6 +402,9 @@ static inline bool isAtSoftWrapOpportunity(const InlineItem& previous, const Inl
         // Both previous and next items are non-whitespace text.
         // [text][text] : is a continuous content.
         // [text-][text] : after [hyphen] position is a soft wrap opportunity.
+        auto currentAndNextHaveSameParent = &currentInlineTextItem.layoutBox().parent() == &nextInlineTextItem.layoutBox().parent();
+        if (currentAndNextHaveSameParent && !TextUtil::isWrappingAllowed(currentInlineTextItem.style()))
+            return false;
         return endsWithSoftWrapOpportunity(currentInlineTextItem, nextInlineTextItem);
     }
     if (previous.layoutBox().isListMarkerBox()) {