Currently when users ignore a discussion and close it - there isn't an easy way to see those ignored discussions and undo it.
Ignoring discussions could be used as a feature to temporarily reduce visibility over discussions you don't have any interest in for the moment, but may want to come back to them later.
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Proposal:
- Add a filter select box above the main discussions listing index page, with option to show "Hidden"
... in future this could be used to add additional filters to narrow down the discussions more, and extensions can add their own options to that filter list.