QQuickRepeater: Fix interaction with Package

Amends 3b806a18cc665b5ae0e12d45fe170bfc3f00352a.
Eric's change tried to tackle the issue by making the PartModel more
well-behaved. However, this still left some issues, as exhibited by the
linked bug. This time, we simply make the repeater more robust, and
setup d->deletables if it's not done yet.

Pick-to: 5.15
Fixes: QTBUG-71964
Change-Id: I58c80c84f73fddaea5d6030f92ffff219ecf2b71
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/auto/quick/qquickrepeater/data/package2.qml b/tests/auto/quick/qquickrepeater/data/package2.qml
new file mode 100644
index 0000000000..0ceb34b362
--- /dev/null
+++ b/tests/auto/quick/qquickrepeater/data/package2.qml
@@ -0,0 +1,36 @@
+import QtQuick 2.0
+import QtQml.Models 2.2
+import QtQuick.Window 2.0
+
+Item {
+    width: 300
+    height: 300
+    visible: true    
+    DelegateModel {
+        id: mdl
+
+        model: 1
+        delegate: Package {
+            Item {
+                id: first
+                Package.name: "first"
+            }
+            Item{
+                id: second
+                Package.name: "second"
+            }
+        }
+    }
+
+    Repeater {
+        model: mdl.parts.first
+    }
+    Repeater {
+        model: mdl.parts.second
+    }
+
+    function setup():  bool {
+        mdl.model = 2
+        return true;
+    }
+}