Fix for Positioner attached property

Modified Positioner attached properties update - original code was trying to update visible and not visible items
by looking only at the positionedItems array, which was wrong as that array contains only visible items. Hidden
ones are stored in unpositionedItems array so second loop was added to affect these items also.

Task-number: QTBUG-30477

Change-Id: If03abb76f4da708884a7e2cf6ade83c09eca45bf
Reviewed-by: Alan Alpert <aalpert@blackberry.com>

1 files changed, 31 insertions, 13 deletions

diff --git a/src/quick/items/qquickpositioners.cpp b/src/quick/items/qquickpositioners.cpp
index 4a74c0bfba..d8dc0f1856 100644
--- a/src/quick/items/qquickpositioners.cpp
+++ b/src/quick/items/qquickpositioners.cpp
@@ -452,7 +452,6 @@ void QQuickBasePositioner::updateAttachedProperties(QQuickPositionerAttached *sp
     QQuickPositionerAttached *prevLastProperty = 0;
     QQuickPositionerAttached *lastProperty = 0;
 
-    int visibleItemIndex = 0;
     for (int ii = 0; ii < positionedItems.count(); ++ii) {
         const PositionedItem &child = positionedItems.at(ii);
         if (!child.item)
@@ -468,28 +467,47 @@ void QQuickBasePositioner::updateAttachedProperties(QQuickPositionerAttached *sp
             property = static_cast<QQuickPositionerAttached *>(qmlAttachedPropertiesObject<QQuickBasePositioner>(child.item, false));
         }
 
-        if (child.isVisible) {
-            if (property) {
-              property->setIndex(visibleItemIndex);
-              property->setIsFirstItem(visibleItemIndex == 0);
+        if (property) {
+            property->setIndex(ii);
+            property->setIsFirstItem(ii == 0);
 
-              if (property->isLastItem())
+            if (property->isLastItem()) {
+                if (prevLastProperty)
+                    prevLastProperty->setIsLastItem(false); // there can be only one last property
                 prevLastProperty = property;
             }
-
-            lastProperty = property;
-            ++visibleItemIndex;
-        } else if (property) {
-            property->setIndex(-1);
-            property->setIsFirstItem(false);
-            property->setIsLastItem(false);
         }
+
+        lastProperty = property;
     }
 
     if (prevLastProperty && prevLastProperty != lastProperty)
         prevLastProperty->setIsLastItem(false);
     if (lastProperty)
         lastProperty->setIsLastItem(true);
+
+    // clear attached properties for unpositioned items
+    for (int ii = 0; ii < unpositionedItems.count(); ++ii) {
+        const PositionedItem &child = unpositionedItems.at(ii);
+        if (!child.item)
+            continue;
+
+        QQuickPositionerAttached *property = 0;
+
+        if (specificProperty) {
+            if (specificPropertyOwner == child.item) {
+                property = specificProperty;
+            }
+        } else {
+            property = static_cast<QQuickPositionerAttached *>(qmlAttachedPropertiesObject<QQuickBasePositioner>(child.item, false));
+        }
+
+        if (property) {
+            property->setIndex(-1);
+            property->setIsFirstItem(false);
+            property->setIsLastItem(false);
+        }
+    }
 }
 
 /*!