[Header] causes alignment shift when opening/closing [FoldoutGroup]

[Former user]

When opening or collapsing [FoldoutGroup]s containing [Header]s, alignment is offset while animating, then "snaps" into place once the open/close animation has completed.

Using Unity v2017.3.0b9.

[Shadow Darkwell]

Apologies--I was not logged in when I posted this issue.