message: Indent section
  No changes to logic, just indentation and comment changes.
diff: @@ -3493,12 +3493,11 @@ bool ActivateBestChain(CValidationState &state, const CChainParams &chainparams,
  {
  CBlockIndex *pindexMostWork = NULL;
  LOCK(cs_main);
  - {
  +
  boost::this_thread::interruption_point();
  if (ShutdownRequested())
  return false;
  - {
  CBlockIndex *pindexOldTip = chainActive.Tip();
  pindexMostWork = FindMostWorkChain();
  @@ -3506,8 +3505,7 @@ bool ActivateBestChain(CValidationState &state, const CChainParams &chainparams,
  // nSequenceId
  if (fParallel)
  {
  - std::set<CBlockIndex *, CBlockIndexWorkComparator>::reverse_iterator it =
  - setBlockIndexCandidates.rbegin();
  + std::set<CBlockIndex *, CBlockIndexWorkComparator>::reverse_iterator it = setBlockIndexCandidates.rbegin();
  while (it != setBlockIndexCandidates.rend())
  {
  if ((*it)->nChainWork == pindexMostWork->nChainWork)
  @@ -3577,13 +3575,10 @@ bool ActivateBestChain(CValidationState &state, const CChainParams &chainparams,
  if (!ActivateBestChainStep(state, chainparams, pindexMostWork,
  pblock && pblock->GetHash() == pindexMostWork->GetBlockHash() ? pblock : NULL, fParallel))
  return false;
  - }
  - // When we reach this point, we switched to a new tip (stored in pindexNewTip).
  - }
  CheckBlockIndex(chainparams.GetConsensus());
  - // Write changes periodically to disk, after relay.
  + // Write changes periodically to disk.
  if (!FlushStateToDisk(state, FLUSH_STATE_PERIODIC))
  return false;
  