why does additional_border_size do exactly, what is it needed for

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:bust_in_silhouette: Asked By Toger5
:warning: Old Version Published before Godot 3 was released.

This question is almost specific to @volzhs
In the theme changes you committed, you have added additional_border_size to style box flat.
Is it just drawing rects to each side of the style box?

:bust_in_silhouette: Reply From: volzhs

as I told you on irc, it’s only for editor theme of godot 3.0.
this is not available with gdscript or theme in editor.