Like I wrote yesterday, I finished off the diametric dimension today and sent the PR today which has been accepted and merged.
And right now I’m working on improving them further like snapping the start point, i.e the arrowhead, to the entity (either a circle or an arc).
This will be achieved by calculating the intersecting point on the said entity, which can be the basis for snap-to-entity feature.
Gurjot Singh Bhatti 
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