Mercurial plugin, merge request with suggested fixes.

src/plugins/mercurial/annotationhighlighter.cpp

@@ -0,0 +1,19 @@
+#include "annotationhighlighter.h"
+#include "constants.h"
+
+using namespace Mercurial::Internal;
+using namespace Mercurial;
+
+MercurialAnnotationHighlighter::MercurialAnnotationHighlighter(const ChangeNumbers &changeNumbers,
+                                                               QTextDocument *document)
+    : VCSBase::BaseAnnotationHighlighter(changeNumbers, document),
+    changeset(Constants::CHANGESETID12)
+{
+}
+
+QString MercurialAnnotationHighlighter::changeNumber(const QString &block) const
+{
+    if (changeset.indexIn(block) != -1)
+        return changeset.cap(1);
+    return QString();
+}