[css-text-3] hyphens:none does not suppress wrapping opportunities after U+002D or U+2010

See issue w3c#3434.

Author: frivoal

css-text-3/Overview.bs

@@ -2153,7 +2153,9 @@ Line Breaking Details</h3>
       or on text selection or searching.
 
     <p>Hyphenation occurs when the line breaks at a valid <dfn>hyphenation opportunity</dfn>,
-      which creates a <a>soft wrap opportunity</a> within the word.
+      which creates a <a>soft wrap opportunity</a> within the word
+      where a visually indication of the split is made when actually wrapping,
+      as discussed above.
       In CSS it is controlled with the 'hyphens' property.
       CSS Text Level 3 does not define the exact rules for hyphenation,
       however UAs are strongly encouraged to optimize their line-breaking implementation
@@ -2164,6 +2166,13 @@ Line Breaking Details</h3>
          which is particularly important in long-word languages like German.
          https://bugzilla.mozilla.org/show_bug.cgi?id=418975 -->
 
+      Note: The [=soft wrap opportunity=] introduced by
+      the U+002D HYPHEN-MINUS character
+      or the U+2010 HYPHEN character
+      is not a [=hyphenation opportunity=],
+      as no visual indication of the split is created <em>when wrapping</em>:
+      these characters are visible whether the line is wrapped at that point or not.
+
     <pre class="propdef">
     Name: hyphens
     Value: none | manual | auto
@@ -2184,6 +2193,11 @@ Line Breaking Details</h3>
       <dt><dfn>none</dfn>
         <dd>Words are not hyphenated, even if characters inside
           the word explicitly define <a>hyphenation opportunities</a>.
+
+          Note: This does not suppress existing the [=soft wrap opportunities=]
+          introduced by always visible characters such as
+          U+002D HYPHEN-MINUS
+          or U+2010 HYPHEN.
       <dt><dfn>manual</dfn>
         <dd>Words are only hyphenated where there are characters inside the word
           that explicitly suggest <a>hyphenation opportunities</a>.

css-text-3/test-coverage.html

@@ -338,7 +338,8 @@ <h3 id="hyphenation-the-hyphens-property"><a href="https://drafts.csswg.org/css-
 	<li>Affects intrinsic sizing
 	<li>manual value
 	<li>none value
-	<li>basic behavior of auto when lang is declared and there’s no ­
+	<li>none does not suppress wrapping after an actual hyphen
+	<li>basic behavior of auto when lang is declared and there’s no soft hyphen
 	<li>However, if, even after breaking at such opportunities, a portion of that word is is still too long to fit on one line, an automatic hyphenation opportunity may be used.
 	<li>When shaping scripts such as Arabic are allowed to break within words due to hyphenation, the characters must still be shaped as if the word were not broken
 </ul>