Merge #16153: Qt: Add antialiasing to traffic graph widget

db26e8e22822c65a3817b16805f5ba9ad2235f93 Add antialiasing to traffic graph widget (Josu Goñi)

Pull request description:

  Before:

  ![image](https://user-images.githubusercontent.com/25986871/58974389-92559c00-87c2-11e9-9673-0c47ac71de2e.png)

  After:

  ![image](https://user-images.githubusercontent.com/25986871/58974280-56223b80-87c2-11e9-8fcc-1e5d299dd1e2.png)

ACKs for top commit:
  laanwj:
    ACK db26e8e22822c65a3817b16805f5ba9ad2235f93

Tree-SHA512: d795809458522a1ec19e236de30c2c5070960544162323324f0d4e2f49c3590fe7756e924f1021056106b4c52dcb564e690c15f85a15ea35342badf72653d534

1 files changed, 1 insertions, 0 deletions

diff --git a/src/qt/trafficgraphwidget.cpp b/src/qt/trafficgraphwidget.cpp
index 1588be8da3..006007be63 100644
--- a/src/qt/trafficgraphwidget.cpp
+++ b/src/qt/trafficgraphwidget.cpp
@@ -104,6 +104,7 @@ void TrafficGraphWidget::paintEvent(QPaintEvent *)
         }
     }
 
+    painter.setRenderHint(QPainter::Antialiasing);
     if(!vSamplesIn.empty()) {
         QPainterPath p;
         paintPath(p, vSamplesIn);