init: completely remove -zapwallettxes (remaining hidden option)

The `-zapwallettxes` functionality has been removed in v0.21.0
(see commit 3340dba / PR bitcoin#19671),
with the parameter being kept as hidden option, to inform users via
an exit error that `abandontransaction` should be used instead.

As any guides that still suggest to use `-zapwallettxes` would refer to
a Bitcoin Core version that is EOL since many years (i.e. <= v0.20.x),
it is highly unlikely that the error caused by the option is still
relevant for any user, hence it seems fine to remove it now.

src/wallet/init.cpp

@@ -95,8 +95,6 @@ void WalletInit::AddWalletOptions(ArgsManager& argsman) const
 
  argsman.AddArg("-walletrejectlongchains", strprintf("Wallet will not create transactions that violate mempool chain limits (default: %u)", DEFAULT_WALLET_REJECT_LONG_CHAINS), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::WALLET_DEBUG_TEST);
  argsman.AddArg("-walletcrosschain", strprintf("Allow reusing wallet files across chains (default: %u)", DEFAULT_WALLETCROSSCHAIN), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::WALLET_DEBUG_TEST);
-
- argsman.AddHiddenArgs({"-zapwallettxes"});
 }
 
 bool WalletInit::ParameterInteraction() const
@@ -118,10 +116,6 @@ bool WalletInit::ParameterInteraction() const
  LogPrintf("%s: parameter interaction: -blocksonly=1 -> setting -walletbroadcast=0\n", __func__);
  }
 
- if (gArgs.IsArgSet("-zapwallettxes")) {
- return InitError(Untranslated("-zapwallettxes has been removed. If you are attempting to remove a stuck transaction from your wallet, please use abandontransaction instead."));
- }
-
  return true;
 }
 

test/lint/check-doc.py

@@ -23,7 +23,7 @@
 CMD_GREP_WALLET_HIDDEN_ARGS = r"git grep --function-context 'void DummyWalletInit::AddWalletOptions' -- {}".format(CMD_ROOT_DIR)
 CMD_GREP_DOCS = r"git grep --perl-regexp '{}' {}".format(REGEX_DOC, CMD_ROOT_DIR)
 # list unsupported, deprecated and duplicate args as they need no documentation
-SET_DOC_OPTIONAL = set(['-h', '-help', '-dbcrashratio', '-forcecompactdb', '-zapwallettxes'])
+SET_DOC_OPTIONAL = set(['-h', '-help', '-dbcrashratio', '-forcecompactdb'])
 
 
 def lint_missing_argument_documentation():