UrlHelper::buildQuery() should decode also the colon character?

Problem/Motivation

Trying to add a url in a Link field whit a query params that holds an url, the colon inside this query parameter is substitute with a %3A that not always works.
Example: The url https://www.mysite.com/mypath?target=https://my.other.site is escaped as https://www.mysite.com/mypath?target=https%3A//my.other.site inside the a tag and some site may not accept it as a parameter.

Steps to reproduce

- Create a content-type
- Add at least one Link field (with title)
- Create a new content
- Fill the link field with a url as written above
- The rendered link has a %3A in its query string

Proposed resolution

Inside the UrlHelper::buildQuery() function add the substitution of the colon escape character. I made a possible temporary workaround waiting for a better solution.