I use this function to let the user set StrokeThickness of selected links.
diagram1.getSelection().links.forEach(function (link) {
link.setTag(t);//StrokeThickness is not savedtoxml, so save it in tag and restore when loading
link.setStrokeThickness(t);
link.invalidate();
});

When the user now selects the link from 3 to 1 (picture in attachment) and sets the strokethickness to some value (4), all the anchorpoints in the entire diagram get this strokeThickness.

It happens when I have a circular link-combination and from the link that is last made the strokethickness is changed. Not if a make a selection of links without this last-made link.

Is there a solution ?

I found when I set the StrokeThickness of a node: the anchorpoints get the same strokeThickness. Setting the strokeThickness of the node back to 1 helps, but not when the anchorpoints have become fat by making the links fat.

Hi,

It turned out to be a bug for AnchorPoints with mark shapes set to Circle not resetting the lineWidth of canvas' drawing context. You can find a fix on the PM page. It should also serialize link.strokeThickness as long as you also set link.stroke (both are necessary for creating server-side Pen object).

I hope that helps,
Stoyan