In the filters box at the top of the interface -- see T132352
There's an input field that allows the user to filter by WikiProject.
* The default state (empty WikiProject filters) is to show all open cases.
* The user can start typing in the input field; this opens an autocomplete list of existing WikiProjects.
* Choosing a WikiProject adds a bubble with the project name to the filters.
* Multiple WikiProjects can be in the filter at the same time; this loads cases that are either in one WikiProject or the other, or both.
* Clicking on an X for a WikiProject bubble deletes it from the list.
* Clicking Submit refreshes the list showing only the items that belong to the chosen WikiProjects.
Additionally: The WikiProject bubbles in the item listings are clickable. When the user clicks on a WP bubble, it opens a new tab, where the filter is set to All open cases, with the selected WikiProject active.
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