Navigation bug: persisting action parameter after searching is blocking the following page browsing

[plutonik-a]

Problem:
When clicking a link from a search result, the action parameter is persisting, so that you're unable to browse to the subchapter afterwards.

Must-have:
When clicking on a link, the action parameter should be deleted, as the actual search has been completed from a user's point of view..

Steps to reproduce:

1. Perform a search for keyword "behaviours"
2. Click on the first search result -> last link in the breadcrumb

3. What you see on the right side is the expected chapter "behaviours", but you are unable to browse any subchapters like "available behaviours", as you're still having the "action" parameter in the URL. Click on the parent chapter "Processing Model Syntax" in the sidebar (I knew where to look, but this isn't obvious for first time visitors)

4. Now the sidebar will display the containing subchapter. But clicking on it won't do anything, you will stay on the previously searched "behaviours" chapter.

5. Delete the "action=search&" part off the URL and normal browsing the content will work again.

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Also, problem with browser navigation, see comment below: #29 (comment)

[plutonik-a]

Found another case:

1. When browsing to page https://teipublisher.com/exist/apps/tei-publisher/doc/documentation.xml?id=docker the correct page about "docker" opens.
2. If you then browse to any other chapter by clicking in the table of contents on the left sidebar (i.e. chapter "installation", https://teipublisher.com/exist/apps/tei-publisher/doc/documentation.xml?id=docker&root=2.7.6), the id="docker" parameter will persist in the url.
3. If you now try to browse back via the back button of your browser, you are not able to open chapter "docker", as it doesn't seem to be stored.