Add button to scroll to top when activity list is long.

Signed-off-by: Camila Ayres <hello@camilasan.com>

Author: camilasan

src/gui/tray/ActivityList.qml

@@ -114,6 +114,30 @@ ScrollView {
             }
         }
 
+        Row {
+            anchors.bottom: parent.bottom
+            anchors.right: parent.right
+
+            Button {
+                id: scrollToTopButton
+
+                hoverEnabled: true
+                padding: Style.smallSpacing
+
+                Accessible.role: Accessible.Button
+                Accessible.name: qsTr("Scroll to top")
+                Accessible.onPressAction: scrollToTopButton.clicked()
+
+                icon.source: "image://svgimage-custom-color/chevron-double-up.svg/" + palette.buttonText
+                icon.width: Style.activityListButtonIconSize
+                icon.height: Style.activityListButtonIconSize
+
+                onClicked: controlRoot.scrollToTop()
+
+                visible: !controlRoot.atYBeginning && controlRoot.contentHeight > controlRoot.height
+            }
+        }
+
         Column {
             id: placeholderColumn
             width: parent.width * 0.8

theme.qrc.in

@@ -241,5 +241,6 @@
         <file>theme/send.svg</file>
         <file>theme/call-notification.wav</file>
         <file>theme/talk-app.svg</file>
+        <file>theme/chevron-double-up.svg</file>
     </qresource>
 </RCC>