Merge bitcoin-core/gui#517: refactor, qt: Use std::chrono for parameters of QTimer methods

51250b0906e56b39488304208ad119c951b4ae7d refactor, qt: Use std::chrono for input_filter_delay constant (Hennadii Stepanov)
f3bdc143b67e8a5e763071a0774f6d994ca35c57 refactor, qt: Add SHUTDOWN_POLLING_DELAY constant (Hennadii Stepanov)
0e193deb523a4fa04e0ee69bd66f917895802ac9 refactor, qt: Use std::chrono for non-zero arguments in QTimer methods (Hennadii Stepanov)
6f0da958116ecc0e06332fad2f490e37b6884166 refactor, qt: Use std::chrono in ConfirmMessage parameter (Hennadii Stepanov)
33d520ac538fcd6285fd958578f1bd26295592e4 refactor, qt: Use std::chrono for MODEL_UPDATE_DELAY constant (Hennadii Stepanov)

Pull request description:

  Since Qt 5.8 `QTimer` methods have overloads that accept `std::chrono::milliseconds` arguments:
  - [`QTimer::singleShot`](https://doc.qt.io/archives/qt-5.9/qtimer.html#singleShot-8)
  - [`QTimer::start`](https://doc.qt.io/archives/qt-5.9/qtimer.html#start-2)

ACKs for top commit:
  promag:
    Code review ACK 51250b0906e56b39488304208ad119c951b4ae7d.
  shaavan:
    reACK 51250b0906e56b39488304208ad119c951b4ae7d

Tree-SHA512: aa843bb2322a84c0c2bb113d3b48d7bf02d7f09a770779dcde312c32887f973ef9445cdef42f39edaa599ff0f3d0457454f6153aa130efadd989e413d39c6062

1 files changed, 3 insertions, 2 deletions

diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 9f3dd42b56..6a2781079c 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -41,6 +41,7 @@
 #endif // ENABLE_WALLET
 
 #include <boost/signals2/connection.hpp>
+#include <chrono>
 #include <memory>
 
 #include <QApplication>
@@ -412,10 +413,10 @@ void BitcoinApplication::initializeResult(bool success, interfaces::BlockAndHead
             connect(paymentServer, &PaymentServer::message, [this](const QString& title, const QString& message, unsigned int style) {
                 window->message(title, message, style);
             });
-            QTimer::singleShot(100, paymentServer, &PaymentServer::uiReady);
+            QTimer::singleShot(100ms, paymentServer, &PaymentServer::uiReady);
         }
 #endif
-        pollShutdownTimer->start(200);
+        pollShutdownTimer->start(SHUTDOWN_POLLING_DELAY);
     } else {
         Q_EMIT splashFinished(); // Make sure splash screen doesn't stick around during shutdown
         requestShutdown();