[vcs] IDEA-131714 copy full revision number at least until the option

is available for user and/or we guarantee that the short hash we
give is enough.

platform/vcs-impl/src/com/intellij/openapi/vcs/history/CopyRevisionNumberAction.java

@@ -67,7 +67,7 @@ public class CopyRevisionNumberAction extends DumbAwareAction {
     return StringUtil.join(revisions, new Function<VcsRevisionNumber, String>() {
       @Override
       public String fun(VcsRevisionNumber revision) {
-        return revision instanceof ShortVcsRevisionNumber ? ((ShortVcsRevisionNumber)revision).toShortString() : revision.asString();
+        return revision.asString();
       }
     }, " ");
   }