[css-text-3] Move break-spaces from overflow-wrap to white-space

Closes #2465

Author: frivoal

css-text-3/Overview.bs

@@ -418,7 +418,7 @@ Characters and Letters</h3>
 
   <pre class="propdef">
   Name: white-space
-  Value: normal | pre | nowrap | pre-wrap | pre-line
+  Value: normal | pre | nowrap | pre-wrap | break-spaces | pre-line
   Initial: normal
   Applies to: <a>inline boxes</a>
   Inherited: yes
@@ -456,6 +456,20 @@ Characters and Letters</h3>
     <dt><dfn>pre-wrap</dfn></dt>
     <dd>Like ''pre'', this value preserves <a>white space</a>;
       but like ''white-space/normal'', it allows wrapping.
+    <dt><dfn>break-spaces</dfn></dt>
+    <dd>The behavior is identical to that of ''white-space/pre-wrap'',
+      except that:
+      * Any sequence of <a>preserved</a> white space always takes up space,
+        including at the end of the line.
+      * A line breaking opportunity exists after every <a>preserved</a> <a>white space</a> character,
+        including between white space characters.
+
+      As preserved spaces take up space and do not hang,
+      they affect the box's intrinsic sizes ([=min-content size=] and [=max-content size=]).
+
+      <p class="note">This value does not guarantee that there will never be any overflow due to spaces:
+      for example, if the line length is so short that even a single space does not fit,
+      overflow is unavoidable.</p>
     <dt><dfn>pre-line</dfn></dt>
     <dd>Like ''white-space/normal'', this value collapses consecutive spaces and allows wrapping,
       but preserves <a>segment breaks</a> in the source as <a>forced line breaks</a>.
@@ -473,6 +487,7 @@ Characters and Letters</h3>
         <th>New Lines</th>
         <th>Spaces and Tabs</th>
         <th>Text Wrapping</th>
+        <th>End-of-line spaces</th>
       </tr>
     </thead>
     <tbody>
@@ -481,30 +496,42 @@ Characters and Letters</h3>
         <td>Collapse</td>
         <td>Collapse</td>
         <td>Wrap</td>
+	<td>Remove</td>
       </tr>
       <tr>
         <th>''pre''</th>
         <td>Preserve</td>
         <td>Preserve</td>
         <td>No wrap</td>
+	<td>Preserve</td>
       </tr>
       <tr>
         <th>''nowrap''</th>
         <td>Collapse</td>
         <td>Collapse</td>
         <td>No wrap</td>
+	<td>Remove</td>
       </tr>
       <tr>
         <th>''pre-wrap''</th>
         <td>Preserve</td>
         <td>Preserve</td>
         <td>Wrap</td>
+	<td>Collapse or hang</td>
+      </tr>
+      <tr>
+        <th>''break-spaces''</th>
+        <td>Preserve</td>
+        <td>Preserve</td>
+        <td>Wrap</td>
+        <td>Wrap</td>
       </tr>
       <tr>
         <th>''pre-line''</th>
         <td>Preserve</td>
         <td>Collapse</td>
         <td>Wrap</td>
+        <td>Remove</td>
     </tbody>
   </table>
 
@@ -623,7 +650,7 @@ Characters and Letters</h3>
           invisible, but retains its <a>soft wrap opportunity</a>, if any.)</li>
       </ol>
     </li>
-    <li><p>If 'white-space' is set to ''pre'' or ''pre-wrap'',
+    <li><p>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.
       However, a <a>soft wrap opportunity</a> exists at the end of the sequence.
 
@@ -669,7 +696,7 @@ Characters and Letters</h3>
     <h4 id="line-break-transform">
       Segment Break Transformation Rules</h4>
 
-      <p>When 'white-space' is ''pre'', ''pre-wrap'', or ''pre-line'',
+      <p>When 'white-space' is ''pre'', ''pre-wrap'', ''break-spaces'', or ''pre-line'',
       <a>segment breaks</a> are not <a>collapsible</a>
       and are instead transformed into a preserved line feed (U+000A).
 
@@ -730,19 +757,18 @@ Characters and Letters</h3>
         (ignoring any intervening <a>inline box</a> boundaries)
         is removed.
       <li>If spaces or tabs at the end of a line are non-collapsible
-         but have 'white-space' set to ''pre-wrap'':
-	 <ul>
-	   <li>If 'overflow-wrap' does not specify ''overflow-wrap/break-spaces''
+        <ul>
+          <li>If 'white-space' is set to ''pre-wrap'',
              the UA must either <a>hang</a> the <a>white space</a>
              or visually collapse the character advance widths
              of any overflowing spaces
              such that they don't take up space in the line.
 
              Note: Hanging the white space rather than collapsing it
              allows users to see the space when selecting or editing text.
-	   <li>Otherwise
-	     (i.e. 'overflow-wrap' property specifies ''overflow-wrap/break-spaces''),
+          <li>If 'white-space' is set to ''break-spaces'',
              hanging or collapsing the advance width of spaces at the end of the line is not allowed.
+        </ul>
 
     </ol>
 
@@ -1215,7 +1241,7 @@ Line Breaking Details</h3>
 
   <pre class="propdef">
   Name: overflow-wrap, word-wrap
-  Value: normal | break-word || break-spaces
+  Value: normal | break-word
   Initial: normal
   Applies to: <a>inline boxes</a>
   Inherited: yes
@@ -1247,20 +1273,6 @@ Line Breaking Details</h3>
       Shaping characters are still shaped as if the word were not
       broken, and grapheme clusters must stay together as one unit.
       No hyphenation character is inserted at the break point.
-    <dt><dfn>break-spaces</dfn></dt>
-    <dd>Line breaks are handled as usual,
-      except that:
-      * Any sequence of <a>preserved</a> white space always takes up space,
-        including at the end of the line.
-      * A line breaking opportunity exists after every <a>preserved</a> <a>white space</a> character,
-        including between white space characters.
-
-      As preserved spaces take up space and do not hang,
-      they affect the box's intrinsic sizes ([=min-content size=] and [=max-content size=]).
-
-      <p class="note">This value does not guarantee that there will never be any overflow due to spaces:
-      for example, if the line length is so short that even a single space does not fit,
-      overflow is unavoidable.</p>
 
     </dl>