Image : right half.

SItuation : TreeView is said to prefer 100x100 size. Border is said to align on bottom-right.
But, it is not 100 in height, but it could be, so that it could be aligned to bottom-right.

RULE ControlsAutomatedTestSuite/javafx/scene/control/test/mixedpanes/ControlsLayoutPart1Test/BorderTest Exception java.lang.AssertionError: Probably screenshots need to be updated