[css-text-4] Add some issue discussion links.

Author: fantasai

css-text-4/Overview.bs

@@ -189,13 +189,17 @@ Text Wrap Settings: the 'text-wrap' property</h3>
 			line. If the text breaks, line-breaking restrictions are honored as for
 			''text-wrap/normal''.
 
+			Issue: Should this maybe be handled by 'break-inside'?
+
 		<dt><dfn>balance</dfn>
 		<dd>
 			Same as ''text-wrap/normal'' for inline-level elements.
 			For block-level elements line breaks are chosen to minimize the deviation from the average line length over the entire element
 			(including lines that end in a forced break).
 			The exact algorithm is UA-defined.
 
+			Issue: See <a href="http://www.w3.org/mid/FF4ADEBA-889C-4268-89C5-1C2C83C5ABCE@rivoal.net">some issues</a>.
+
 			UAs may treat this value as ''text-wrap/normal'' if there are more than ten lines to balance.
 
 	</dl>
@@ -265,8 +269,33 @@ Example of using 'text-wrap: avoid' in presenting a footer</h4>
 		</pre>
 	</div>
 
+<h2 id="last-line-limits">
+Last Line Minimum Length</h2>
+
+	<div class="issue">
+		See <a href="http://www.w3.org/mid/0BD85DFF-A147-44EF-B18A-FF03C3D67EF0@verou.me">thread</a>.
+		Issue is about requiring a minimum length for lines.
+		Common measures seem to be
+
+		<ul>
+			<li>At least as long as the text-indent.
+			<li>At least X characters.
+			<li>Percentage-based.
+		</ul>
+
+		Suggestion for value space is ''match-indent | <<length>> | <<percentage>>''
+		(with ''Xch'' given as an example to make that use case clear).
+		Alternately <<integer>> could actually count the characters.
+
+		It's unclear how this would interact with text balancing (above);
+		one earlier proposal had them be the same property
+		(with ''100%'' meaning full balancing).
+
+		People have requested word-based limits, but since this is really
+		dependent on the length of the word, character-based is better.
+
 <h2 id="white-space-property">
-White Space and Wrapping Shorthand: the 'white-space' property</h2>
+Shorthand for White Space and Wrapping: the 'white-space' property</h2>
 
 	Diff needs to have the shorthand details
 
@@ -335,7 +364,7 @@ Hyphenation Character Limits: the 'hyphenate-limit-chars' property</h3>
 
 	<pre class="propdef">
 	Name: hyphenate-limit-chars
-	Value: [auto | &lt;integer&gt;]{1,3}
+	Value: [ auto | <<integer>> ]{1,3}
 	Initial: auto
 	Applies to: all elements
 	Inherited: yes