As this bug https://bugs.launchpad.net/ubuntu/+source/ubuntu-ui-toolkit/+bug/1572525 made clear, there is a change in behavior when you are using a PageHeader with a Flickable that does not initially have topMargin 0. The PageHeader used to override the topMargin of its flickable and set it to header.height, but now it *adds* the header.height to the existing Flickable topMargin. This was done for apps that require to have a specific topMargin to work with the header, and to solve some bugs where the topMargin was not always correctly reverted when multiple headers have the same value for flickable set.
So if you have an app using PageHeader that has a Flickable where you do not touch the topMargin, you should be fine. But if you are setting a custom topMargin the behavior may change, so please test your app with the latest UI Toolkit from rc-proposed. If there are any issues that you get stuck with, feel free to contact me (t1mp in #ubuntu-app-devel) or reply to this e-mail. Greets, Tim.
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