Popup position is not respected when near corner of window

[MindFreeze]

Steps

1. Create a popup with a trigger at the top right corner of the window.
2. Make it a large popup so it can't fit on any side of the trigger without going out of the window

Expected Result

It should be positioned according to the position prop.

Actual Result

It always defaults to the last value in the POSITIONS enum excluding the value from the position prop (mostly "bottom center"). And it never uses the user specified value from the prop.

Version

0.67.0

Testcase

Just look at https://github.com/Semantic-Org/Semantic-UI-React/blob/master/src/modules/Popup/Popup.js#L234