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By making |headerBackgroundView| and |headerContentView| UIStackView instances, we can let UIStackView figure out a lot of the constraints on its own and simplify the code significantly: * |headerBackgroundView| is a 1-item UIStackView that just contains |headerContentView|. It inherits the root view's margins so that |headerContentView| is laid out respecting the safe area and the layout guide margins. * |headerContentView| is a horizontal UIStackView containing the navigation buttons and the location bar. The items are vertically centralized and fill the UIStackView horizontally according to the content hugging settings (i.e. the location bar expands horizontally, the buttons do not). By comparing screenshots of before and after with //tools/image_diff, the only difference is a small change to the location bar in height, as it no longer has a hardcoded size of 32 points. Change-Id: I9f27dd1e4e60b59b2ac1844c0ae965dad17f9fc6 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6176975 Auto-Submit: Raphael Kubo da Costa <kubo@igalia.com> Reviewed-by: John Wu <jzw@chromium.org> Commit-Queue: John Wu <jzw@chromium.org> Cr-Commit-Position: refs/heads/main@{#1407650}
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