[css-ruby-1] Update Changes list.

Author: fantasai

css-ruby-1/Overview.bs

@@ -2178,6 +2178,50 @@ Changes</h2>
 
 	This section documents the changes since previous publications.
 
+<h3 id="changes-20200429">
+Changes since the 29 April 2020 WD</h3>
+
+	<ul>
+		<li>Added ''ruby-position/alternate'' keyword to 'ruby-position'
+			and made it the [=initial value=].
+		<li>Renamed <css>collapse</css> value of 'ruby-merge' to ''ruby-merge/merge''.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/5004">Issue 5004</a>)
+		<li>Specified more precisely which properties apply to the various ruby display types
+			([[#box-style]])
+			and defined ruby, ruby base, and ruby annotation boxes
+			to behave the same as regular [=inline boxes=] except as otherwise specified.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/4935">Issue 4935</a>,
+			<a href="https://github.com/w3c/csswg-drafts/issues/4936">Issue 4936</a>,
+			<a href="https://github.com/w3c/csswg-drafts/issues/4976">Issue 4976</a>,
+			<a href="https://github.com/w3c/csswg-drafts/issues/4979">Issue 4979</a>)
+		<li>Rewrote [[#ruby-layout]] to more clearly define
+			[=interlinear=] and [=inter-character=] ruby layout.
+			[=Inter-character ruby=] is now based on [=inline block=] layout,
+			and its interaction with [=interlinear=] ruby
+			is also now well-defined.
+			Inline-axis space distribution for [=interlinear ruby=]
+			is now more precisely defined
+			(modeled on ''grid-template-columns/max-content'' grid tracks),
+			and their block-axis layout is defined
+			to use bases’ and annotations’ margin boxes.
+		<li>Defined handling of nested ruby
+			by accounting for their base and annotation containers
+			in the block-axis sizing of [=interlinear ruby=].
+			(<a href="https://github.com/w3c/csswg-drafts/issues/4986">Issue 4986</a>,
+			<a href="https://github.com/w3c/csswg-drafts/issues/4980">Issue 4980</a>)
+		<li>Specified more precisely how 'ruby-align' works.
+		<li>Loosened requirement that ruby overhang not affect the alignment of ruby contents,
+			added requirement that it not cause ruby content to collide with adjacent content.
+		<li>Clarified interaction of bidi reordering and [=merged annotations=].
+			([[#bidi]])
+		<li>Tightened up normative prose throughout.
+		<li>Improved [[#intro|introduction]], examples, and other informative text.
+	</ul>
+
+	Note: There remain many open issues, see <a href="https://drafts.csswg.org/css-ruby-1/issues-wd-2020">Disposition of Comments</a>
+	and the <a href="https://github.com/w3c/csswg-drafts/issues?q=is%3Aissue+label%3Acss-ruby-1">newer issues</a>
+	tracked in GitHub.
+
 <h3 id="changes-20140805">
 Changes since the 5 August 2014 WD</h3>