fix(overlay): centered flexible positioning not working in some browsers #10701
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Currently using centering with the `FlexibleConnectedPositionStrategy` in flexible mode doesn't work in browsers that haven't implemented [the new absolute position behavior inside a flex container](https://developers.google.com/web/updates/2016/06/absolute-positioned-children) (e.g. iOS Safari), which means that the position will be thrown off completely. These changes rework the position strategy to use `position: static` and `justify-content`/`align-items`, rather than `position: absolute`, to push the overlay pane to the proper edge of the bounding box in flexible mode. As a result, support for having flexible dimensions in only one direction has been removed.
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Currently using centering with the
FlexibleConnectedPositionStrategyin flexible mode doesn't work in browsers that haven't implemented the new absolute position behavior inside a flex container (e.g. iOS Safari), which means that the position will be thrown off completely. These changes rework the position strategy to useposition: staticandjustify-content/align-items, rather thanposition: absolute, to push the overlay pane to the proper edge of the bounding box in flexible mode. As a result, support for having flexible dimensions in only one direction has been removed.