Put OfferCreate bug fix on a ledger switch:

The fix for an off-by one bug that overstates the account reserve
during OfferCreate is set to become active on August 3rd. Before
this date, the program will exhibit the old behavior.

src/ripple/app/tx/impl/CreateOffer.cpp

@@ -421,6 +421,13 @@ CreateOffer::format_amount (STAmount const& amount)
 STAmount
 CreateOffer::getAccountReserve (SLE::pointer account)
 {
+    // Mon Aug 3 11:00:00am PDT
+    static NetClock::time_point const switchoverTime (
+        std::chrono::seconds (491940000));
+    if (ctx_.view().info().parentCloseTime <=
+            switchoverTime.time_since_epoch().count())
+        return STAmount (ctx_.view().fees().accountReserve(
+            deprecatedWrongOwnerCount_+1));
     return STAmount (ctx_.view().fees().accountReserve(
         account->getFieldU32 (sfOwnerCount) + 1));
 }
@@ -559,6 +566,8 @@ CreateOffer::applyGuts (ApplyView& view, ApplyView& view_cancel)
     auto const sleCreator = view.peek (
         keylet::account(account_));
 
+    deprecatedWrongOwnerCount_ = sleCreator->getFieldU32(sfOwnerCount);
+
     std::uint32_t const uAccountSequenceNext = sleCreator->getFieldU32 (sfSequence);
     std::uint32_t const uSequence = mTxn.getSequence ();
 

src/ripple/app/tx/impl/CreateOffer.h

@@ -112,6 +112,7 @@ private:
 private:
     // What kind of offer we are placing
     CrossType cross_type_;
+    std::uint32_t deprecatedWrongOwnerCount_;
 };
 
 }

src/ripple/ledger/ReadView.h

@@ -21,6 +21,7 @@
 #define RIPPLE_LEDGER_READVIEW_H_INCLUDED
 
 #include <ripple/ledger/detail/ReadViewFwdRange.h>
+#include <ripple/basics/chrono.h>
 #include <ripple/protocol/Indexes.h>
 #include <ripple/protocol/Protocol.h>
 #include <ripple/protocol/STLedgerEntry.h>