Add a new querystring_with tag to help with building links.

Review Request #7268 — Created April 29, 2015 and submitted — Latest diff uploaded

david
Djblets
release-0.9.x
e04c0d4...
djblets

We often have cases where we want to create a link that will go back to the
same page, but with a single different querystring parameter. Traditionally
these links have been hard-coded, and doing so will drop all the other things
in the querystring. We do have a helper utility for doing what we want in
python (get_url_params_except), which is used in some places.

This change adds a new templatetag, querystring_with, that will build a new
querystring that has everything in the current one, but with the value of a
single variable changed.

Used this with other changes.

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