Router rotate endDirection with link

[LucasWijk]

Introduction

To connect incoming links to a thick link, i put a subelement red rectangle on the link with anchor: center and connectionPoint: boundary. and the router is manhattan with endDirections: ['top', 'bottom']. But when I rotate the link, the arrowheads stays in global top and bottom, instead of local (from the link's perspective) top and bottom.

See the image for what I mean. I want the arrowheads to stay attached to the red rectangle, but in the middle, which would be in local coordinates just the top and bottom of the thick link.

Steps to reproduce

Restrictions & Constraints

No response

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JointJS