Test bidirectional position x must be invariant

[kygoh]

<div style="float: left; border-right: 100px solid black; direction: rtl">abc</div>

x is by definition the distance from the left, it doesn’t depend on the text direction. Believe me, that’s a really bad idea to change this. 😄

Originally posted by @liZe in #2056 (comment)

[liZe]

Thank you!