Fix bugs in edit drawer

- As the list may get reset on save, the dive_id effectively changes
  since currentItem isn't updated. So after editing, we end up with a
  different currentItem than visible. This is very unintuitive, but
  has to do with the model resetting. It would result in the edit view not
  showing the current dive when opened the second time. Let's make sure
  that out currentItem is always the visible one before we're filling
  the data into the edit page.
- Close the drawer when we're navigating away from the dive item, for
  example when hitting the back button.

Signed-off-by: Sebastian Kügler <sebas@kde.org>

qt-mobile/qml/DiveDetails.qml

@@ -10,6 +10,7 @@ MobileComponents.Page {
 	id: page
 	objectName: "DiveList"
 	property alias currentIndex: diveListView.currentIndex
+
 	mainAction: Action {
 		iconName: editDrawer.opened ? "dialog-cancel" : "document-edit"
 		onTriggered: {
@@ -17,6 +18,10 @@ MobileComponents.Page {
 				editDrawer.close();
 				return;
 			}
+			// After saving, the list may be shuffled, so first of all make sure that
+			// the listview's currentIndex is the visible item
+			// This makes sure that we always edit the currently visible item
+			diveListView.currentIndex = diveListView.indexAt(diveListView.contentX+1, 1);
 			detailsEdit.dive_id = diveListView.currentItem.modelData.dive.id
 			detailsEdit.number = diveListView.currentItem.modelData.dive.number
 			detailsEdit.dateText = diveListView.currentItem.modelData.dive.date
@@ -48,7 +53,7 @@ MobileComponents.Page {
 			currentIndex: -1
 			boundsBehavior: Flickable.StopAtBounds
 			maximumFlickVelocity: parent.width/4
-			cacheBuffer: parent.width/2
+			//cacheBuffer: parent.width/2
 			orientation: ListView.Horizontal
 			focus: true
 			clip: true
@@ -80,6 +85,14 @@ MobileComponents.Page {
 			id: detailsEdit
 			implicitHeight: page.height - MobileComponents.Units.gridUnit*3
 		}
+		// Close the editDrawer when the pageStack navigates away, for example going
+		// back to the listview after the Back button was pressed
+		Connections {
+			target: rootItem.pageStack
+			onCurrentPageChanged: {
+				editDrawer.close();
+			}
+		}
 	}
 
 }