Submit method="GET" must ignore query string

[iurisilvio]

In a HTML form GET submit, the URL must ignore query string.

<!-- index.html -->
<form id="form" method="GET">
    <input type=text name=field />
    <button type="submit">Submit</button>
</form>

browser = RoboBrowser(parser="lxml")
browser.open("http://localhost:8000/")

form = browser.get_form("form")
form["field"] = "value"
browser.submit_form(form)
# browser.url == "http://localhost:8000/?field=value"

form = browser.get_form("form")
form["field"] = "other"
browser.submit_form(form)
# browser.url == "http://localhost:8000/?field=value&field=other"

The url must be http://localhost:8000/?field=other, removing previous query string.