new chatlistview component, file attachments, performance & primitive test

Components/VerticalFadeListView.qml

@@ -7,6 +7,7 @@ CustomListView {
 	id: root
 
 	property real endFadeOpacity: fadeShouldBeActive(false) ? 0 : 1
+	property bool fadeEnabled: true
 	property real fadeAmount: 0.1
 	property real fadeThreshold: 0.0
 	readonly property bool horizontal: orientation === ListView.Horizontal
@@ -17,7 +18,9 @@ CustomListView {
 	}
 
 	function fadeShouldBeActive(isStart: bool): bool {
-		// When content is smaller than flickable size, hide fade when rebound starts.
+		if (!fadeEnabled)
+			return false;
+
 		if (contentSize() + marginStart() + marginEnd() < viewportSize() && rebound.running && ((isStart ? overshootStart() > 0 : overshootStart() < 0))) {
 			return false;
 		}