gitweb: make different blocks of annotated lines have different colors

mercurial/templates/gitweb/map

@@ -96,7 +96,7 fileline = '
   <a href="#{lineid}"></a><span id="{lineid}">{strip(line|escape, '\r\n')}</span>'
 annotateline = '
   <tr id="{lineid}" style="font-family:monospace" class="parity{parity}{ifeq(node, originalnode, ' thisrev')}">
-    <td class="annotate linenr" style="text-align: right;">
+    <td class="annotate linenr parity{blockparity}" style="text-align: right;">
       {if(blockhead,
           '<a href="{url|urlescape}annotate/{node|short}/{file|urlescape}{sessionvars%urlparameter}#l{targetline}">
              {rev}

mercurial/templates/static/style-gitweb.css

@@ -29,6 +29,7 a.list { text-decoration:none; color:#00
 a.list:hover { text-decoration:underline; color:#880000; }
 table { padding:8px 4px; }
 th { padding:2px 5px; font-size:12px; text-align:left; }
+.parity0 { background-color:#ffffff; }
 tr.dark, .parity1, pre.sourcelines.stripes > :nth-child(4n+4) { background-color:#f6f6f0; }
 tr.light:hover, .parity0:hover, tr.dark:hover, .parity1:hover,
 pre.sourcelines.stripes > :nth-child(4n+2):hover,

tests/test-hgweb.t

@@ -340,7 +340,7 static file
 
   $ get-with-headers.py --twice localhost:$HGPORT 'static/style-gitweb.css' - date etag server
   200 Script output follows
-  content-length: 6908
+  content-length: 6947
   content-type: text/css
   
   body { font-family: sans-serif; font-size: 12px; border:solid #d9d8d1; border-width:1px; margin:10px; background: white; color: black; }
@@ -374,6 +374,7 static file
   a.list:hover { text-decoration:underline; color:#880000; }
   table { padding:8px 4px; }
   th { padding:2px 5px; font-size:12px; text-align:left; }
+  .parity0 { background-color:#ffffff; }
   tr.dark, .parity1, pre.sourcelines.stripes > :nth-child(4n+4) { background-color:#f6f6f0; }
   tr.light:hover, .parity0:hover, tr.dark:hover, .parity1:hover,
   pre.sourcelines.stripes > :nth-child(4n+2):hover,