Arrow position degradation in v6

[ogonkov]

In v6 Popup arrow on the opposite side of the Popup

https://preview.gravity-ui.com/uikit/?path=/story/components-overlays-popover--playground&args=placement:bottom-end

With bottom-end and ltr arrow should be at the right side of popup. In Storybook it displays on the left side.

Guide with illustration with right position of arrow https://gravity-ui.com/design/guides/popup#positioning

[ykamendrovskiy]

The sandbox on the site (UIKit-5 at the time of recording) has this behaviour. When you toggle the arrow on and off it positions differently

3brejtg.mov

[ykamendrovskiy]

In storybook some of the arrows position with an offset, especially left-start and right-start.

[amje]

The correct behaviour of popper.js: arrow element is "center aware", arrow is trying to be as close as it can to the anchor's center on cross axis depending on its size. So basically it works as expected. Indeed there are some glitches in Storybook story rendering, that can affect positioning. Window resize helps popper to recalculate properly.