Remove deprecation warning from QtQuickControls2 gallery example

In the "Delegates" page of the gallery example the user is allowed to
swipe over the available `SwipeDelegateComponent`s to show a 'remove'
button, which allows the removal of that item from the containing list
when pressed.

When this happens, an animation is played.
In the code, the animation was attached to the signal handler,
as follows:

```
ListView.onRemove: SequentialAnimation {
...
}
```

This form of attachment has been deprecated as of
Qt 6.1.0, in commit 6eb35df60e, in favor of creating a stand-alone
object and calling the relevant slot from the signal handler,
generating a series of warning when the attachment happens
during the creation of the page.

This patch updates the connection to the new format, avoiding
the generation of the warnings.

Fixes: QTBUG-95562
Change-Id: Ib67cb9b8703dad427c49475c00791fdd5d1b0669
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
(cherry picked from commit 6901fb779a750949e0c436ff2fbfc15d0aae6319)
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 4 insertions, 1 deletions

diff --git a/examples/quickcontrols2/gallery/pages/DelegatePage.qml b/examples/quickcontrols2/gallery/pages/DelegatePage.qml
index d2064d9870..116762154d 100644
--- a/examples/quickcontrols2/gallery/pages/DelegatePage.qml
+++ b/examples/quickcontrols2/gallery/pages/DelegatePage.qml
@@ -193,7 +193,9 @@ Pane {
 
                 // Can't find a way to do this in the SwipeDelegate component itself,
                 // so do it here instead.
-                ListView.onRemove: SequentialAnimation {
+                SequentialAnimation {
+                    id: removeAnimation
+
                     PropertyAction {
                         target: delegateLoader
                         property: "ListView.delayRemove"
@@ -211,6 +213,7 @@ Pane {
                         value: false
                     }
                 }
+                ListView.onRemove: removeAnimation.start()
             }
         }
     }