Show how to achieve aspect-ratio-maintaining effects.

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diff --git a/examples/declarative/aspectratio/scale_to_fit.qml b/examples/declarative/aspectratio/scale_to_fit.qml
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+// The Image primitive does not have any special handling for maintaining
+// aspect ratio. This example shows that you can provide whatever specific
+// behaviour you like.
+//
+// Here, we implement "Scale to Fit" behaviour.
+//
+Rect {
+    // default size: whole image, unscaled
+    width: Image.width
+    height: Image.height
+    color: "gray"
+    clip: true
+
+    Image {
+        id: Image
+        source: "pics/face.png"
+        x: (parent.width-width*scale)/2
+        y: (parent.height-height*scale)/2
+        scale: Math.min(parent.width/width,parent.height/height)
+    }
+}