node_del shifts nodes around, cursors pointing at fake pages
need to have their mc_pg[0] corrected.

Some destination fixups need to happen immediately after nodes
are moved, before rebalancing

The tree height can also increase during rebalance, not just shrink.
This can happen if update_key needs to split a parent branch page.

For those people who insist on ignoring the obvious.

Missed this in 7ce29b9e

Hallvard Furuseth authored 9 years ago and Howard Chu committed 9 years ago

Except we don't catch the user passing F_SUBDATA to
mdb_cursor_<put/del>, like an internal LMDB call.

Don't change mc_dbx because we would need to undo the change if
the txn aborts. Make the fix (for get) match existing code for put.

This reverts commit 47c4e747.

Revert "ITS#8117 fix INTEGERDUP compare"

This reverts commit ba45e0c0.