qt: Use steady clock to throttle GUI notifications

Author: MarcoFalke

src/qt/clientmodel.cpp

@@ -27,8 +27,8 @@
 #include <QThread>
 #include <QTimer>
 
-static int64_t nLastHeaderTipUpdateNotification = 0;
-static int64_t nLastBlockTipUpdateNotification = 0;
+static SteadyClock::time_point g_last_header_tip_update_notification{};
+static SteadyClock::time_point g_last_block_tip_update_notification{};
 
 ClientModel::ClientModel(interfaces::Node& node, OptionsModel *_optionsModel, QObject *parent) :
     QObject(parent),
@@ -221,9 +221,9 @@ void ClientModel::TipChanged(SynchronizationState sync_state, interfaces::BlockT
 
     // Throttle GUI notifications about (a) blocks during initial sync, and (b) both blocks and headers during reindex.
     const bool throttle = (sync_state != SynchronizationState::POST_INIT && synctype == SyncType::BLOCK_SYNC) || sync_state == SynchronizationState::INIT_REINDEX;
-    const int64_t now = throttle ? GetTimeMillis() : 0;
-    int64_t& nLastUpdateNotification = synctype != SyncType::BLOCK_SYNC ? nLastHeaderTipUpdateNotification : nLastBlockTipUpdateNotification;
-    if (throttle && now < nLastUpdateNotification + count_milliseconds(MODEL_UPDATE_DELAY)) {
+    const auto now{throttle ? SteadyClock::now() : SteadyClock::time_point{}};
+    auto& nLastUpdateNotification = synctype != SyncType::BLOCK_SYNC ? g_last_header_tip_update_notification : g_last_block_tip_update_notification;
+    if (throttle && now < nLastUpdateNotification + MODEL_UPDATE_DELAY) {
         return;
     }