Fix warnings in ListView delegate width bindings in manual tests

Bind width to the ListView's width, not the parent, which may be null.

Pick-to: 6.5 6.7 6.8
Change-Id: I020d23bb0c98b3da00db9ffd3400a89cfdeb1810
Reviewed-by: Doris Verria <doris.verria@qt.io>

tests/manual/quickcontrols/screenshots/screenshots.qml

@@ -47,7 +47,7 @@ ApplicationWindow {
                 showDirs: false
             }
             delegate: ItemDelegate {
-                width: parent.width
+                width: snippetsListView.width
                 text: fileName
                 focusPolicy: Qt.NoFocus
 

tests/manual/quickcontrols/testbench/controls/CheckDelegate.qml

@@ -38,7 +38,7 @@ QtObject {
         clip: true
         model: 20
         delegate: CheckDelegate {
-            width: parent.width
+            width: ListView.view.width
             text: "CheckDelegate"
             focusPolicy: Qt.StrongFocus
         }

tests/manual/quickcontrols/testbench/controls/ItemDelegate.qml

@@ -29,7 +29,7 @@ QtObject {
         clip: true
         model: 20
         delegate: ItemDelegate {
-            width: parent.width
+            width: ListView.view.width
             text: "ItemDelegate"
             focusPolicy: Qt.StrongFocus
         }

tests/manual/quickcontrols/testbench/controls/RadioDelegate.qml

@@ -37,7 +37,7 @@ QtObject {
         clip: true
         model: 20
         delegate: RadioDelegate {
-            width: parent.width
+            width: ListView.view.width
             text: "RadioDelegate"
             focusPolicy: Qt.StrongFocus
         }

tests/manual/quickcontrols/testbench/controls/SwipeDelegate.qml

@@ -48,7 +48,7 @@ QtObject {
         clip: true
         model: 20
         delegate: SwipeDelegate {
-            width: parent.width
+            width: ListView.view.width
             text: "SwipeDelegate"
             focusPolicy: Qt.StrongFocus
 

tests/manual/quickcontrols/testbench/controls/SwitchDelegate.qml

@@ -31,7 +31,7 @@ QtObject {
         clip: true
         model: 20
         delegate: SwitchDelegate {
-            width: parent.width
+            width: ListView.view.width
             text: "SwitchDelegate"
             focusPolicy: Qt.StrongFocus
         }