refactor, qt: Use std::chrono for MODEL_UPDATE_DELAY constant

src/qt/clientmodel.cpp

@@ -17,6 +17,7 @@
 #include <netbase.h>
 #include <util/system.h>
 #include <util/threadnames.h>
+#include <util/time.h>
 #include <validation.h>
 
 #include <stdint.h>
@@ -288,7 +289,7 @@ static void BlockTipChanged(ClientModel* clientmodel, SynchronizationState sync_
     const bool throttle = (sync_state != SynchronizationState::POST_INIT && !fHeader) || sync_state == SynchronizationState::INIT_REINDEX;
     const int64_t now = throttle ? GetTimeMillis() : 0;
     int64_t& nLastUpdateNotification = fHeader ? nLastHeaderTipUpdateNotification : nLastBlockTipUpdateNotification;
-    if (throttle && now < nLastUpdateNotification + MODEL_UPDATE_DELAY) {
+    if (throttle && now < nLastUpdateNotification + count_milliseconds(MODEL_UPDATE_DELAY)) {
         return;
     }
 

src/qt/guiconstants.h

@@ -5,10 +5,13 @@
 #ifndef BITCOIN_QT_GUICONSTANTS_H
 #define BITCOIN_QT_GUICONSTANTS_H
 
+#include <chrono>
 #include <cstdint>
 
-/* Milliseconds between model updates */
-static const int MODEL_UPDATE_DELAY = 250;
+using namespace std::chrono_literals;
+
+/* A delay between model updates */
+static constexpr auto MODEL_UPDATE_DELAY{250ms};
 
 /* AskPassphraseDialog -- Maximum passphrase length */
 static const int MAX_PASSPHRASE_SIZE = 1024;