wallet: support fetching scriptPubKeys with minimum descriptor range index

This extra method will be needed for updating the filter set for
faster wallet rescans; after an internal top-up has happened, we only
want to add the newly created scriptPubKeys.

Author: theStack

src/wallet/scriptpubkeyman.cpp

@@ -2644,13 +2644,18 @@ const WalletDescriptor DescriptorScriptPubKeyMan::GetWalletDescriptor() const
 }
 
 const std::unordered_set<CScript, SaltedSipHasher> DescriptorScriptPubKeyMan::GetScriptPubKeys() const
+{
+    return GetScriptPubKeys(0);
+}
+
+const std::unordered_set<CScript, SaltedSipHasher> DescriptorScriptPubKeyMan::GetScriptPubKeys(int32_t minimum_index) const
 {
     LOCK(cs_desc_man);
     std::unordered_set<CScript, SaltedSipHasher> script_pub_keys;
     script_pub_keys.reserve(m_map_script_pub_keys.size());
 
-    for (auto const& script_pub_key: m_map_script_pub_keys) {
-        script_pub_keys.insert(script_pub_key.first);
+    for (auto const& [script_pub_key, index] : m_map_script_pub_keys) {
+        if (index >= minimum_index) script_pub_keys.insert(script_pub_key);
     }
     return script_pub_keys;
 }

src/wallet/scriptpubkeyman.h

@@ -643,6 +643,7 @@ class DescriptorScriptPubKeyMan : public ScriptPubKeyMan
 
     const WalletDescriptor GetWalletDescriptor() const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
     const std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys() const override;
+    const std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys(int32_t minimum_index) const;
 
     bool GetDescriptorString(std::string& out, const bool priv) const;