QQuickLabel: fix background resizing

setBackground() must resize the item if component construction is
already complete.

Change-Id: I76cada5b37257473a9c0146ee1f6de8de6c10218
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
(cherry picked from commit 159599e97750ad1a9208a66303552aa8b4f2cdc7)

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/auto/controls/data/tst_label.qml b/tests/auto/controls/data/tst_label.qml
index 5618fe07..69d273a7 100644
--- a/tests/auto/controls/data/tst_label.qml
+++ b/tests/auto/controls/data/tst_label.qml
@@ -66,6 +66,18 @@ TestCase {
     }
 
     Component {
+        id: backgroundLabel
+        Label {
+            background: Rectangle { }
+        }
+    }
+
+    Component {
+        id: rectangle
+        Rectangle { }
+    }
+
+    Component {
         id: signalSpy
         SignalSpy { }
     }
@@ -115,4 +127,16 @@ TestCase {
         compare(child.font[data.tag], defaultValue)
         compare(childSpy.count, 0)
     }
+
+    function test_background() {
+        var control = createTemporaryObject(backgroundLabel, testCase, {text: "Label"})
+        verify(control)
+
+        compare(control.background.width, control.width)
+        compare(control.background.height, control.height)
+
+        control.background = rectangle.createObject(control)
+        compare(control.background.width, control.width)
+        compare(control.background.height, control.height)
+    }
 }