s:url does not handle equal sign correctly

We discovered a strange case when a URL is passed to s:url. The URL contains an equal sign as part of a parameter value. Example:

https://www.scitepress.org/PublicationsDetail.aspx?ID=GjTu91suYQI=&t=1

This URL works in the browser even though the equal sign that is part of the value of the parameter ID has not been replaced with %3D.

When this URL is passed to an s:url as value then the equal sign disappears. When I put a break point in ComponentTagSupport.doStartTag() I can see that the query string has been split and the component.parameters contains the two parameters (ID and t), but the equal sign is missing. 

The problem seems to be in ServletUrlRenderer.mergeRequestParameters called from beforeRenderUrl. The way the StrutsQueryStringParser.parse splits each param of the queryString on equal sign causes all the equal signs to be used, not just the first. Shouldn't that split be only on the first equal sign so that any remaining equal signs can be considered as part of the value? Just by adding a limit of one to the split should fix this.