Add kinetic scrolling.

main.py

@@ -6,9 +6,8 @@ import sys
 import time
 
 from PySide2.QtCore import QObject, QThread, Signal, Slot
-from PySide2.QtWidgets import (QApplication, QDialog, QGroupBox, QHBoxLayout,
-                               QLabel, QLineEdit, QProgressBar, QPushButton,
-                               QScrollArea, QTabBar, QVBoxLayout, QSplitter, QFrame)
+from PySide2.QtWidgets import (QApplication, QDialog, QLabel, QLineEdit, QProgressBar, QScrollArea, QTabBar,
+                               QVBoxLayout, QFrame, QScroller)
 
 import doc_manager
 
@@ -50,6 +49,9 @@ class Dialog(QDialog):
 
         self.results = QScrollArea(widgetResizable=True)
         layout.addWidget(self.results)
+        QScroller.grabGesture(
+            self.results.viewport(), QScroller.LeftMouseButtonGesture,
+        )
 
         # Options
         self.tabBar = QTabBar(shape=QTabBar.RoundedSouth)