Hi Matt,
not sure, we are displaying lines and polygon in OpenLayers with a
GeoServer 2.16.x (nightly build) and have no such issue.
At this URL we have a proof of concept based on MapStore/OpenLayers and
displaying vector tiles with both SLD and MBStyle client side styling:

http://vtp2018.s3-eu-west-1.amazonaws.com/vtpext-wmts.html#/

When we created it, it was running against a 2.15.x and I don't remember
seeing border issues either.
The jump from 2.11 is a really long one, many changes went into the vector
tiles module in the meantime. Can you show what's going on in your client?

Cheers
Andrea

On Mon, Apr 15, 2019 at 3:09 AM Matt Hakim <[email protected]> wrote:

> Hi,
> We use openlayers and vector tiles to display features on the map.
> After upgrading to 2.15.0 and we apply a new style to highlight the
> feature, gridlines (or a gutter around the tiles) appears within the
> highlighted region. This is a change of behaviour from 2.11.
> Any ideas on what is causing the gridlines to appear?
> If we change the stroke width back to 1 the gridlines disappear.
>
> Regards,
> Matt.
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Please make sure you read the following two resources before posting to this 
list:
- Earning your support instead of buying it, but Ian Turton: 
http://www.ianturton.com/talks/foss4g.html#/
- The GeoServer user list posting guidelines: 
http://geoserver.org/comm/userlist-guidelines.html

If you want to request a feature or an improvement, also see this: 
https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer


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