QML UI: enable caching of the details view

This way the dive on either side should be cached.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

mobile-widgets/qml/DiveDetails.qml

@@ -189,6 +189,7 @@ Kirigami.Page {
 				highlightFollowsCurrentItem: true
 				focus: true
 				clip: false
+				cacheBuffer: parent.width * 3 // cache one item on either side (this is in pixels)
 				snapMode: ListView.SnapOneItem
 				onMovementEnded: {
 					currentIndex = indexAt(contentX+1, 1);