Issue It's frustrating when I'm on the Layout > Manage Blocks page and working with a block that is provided by a View, and then need to tweak that View but have no way to get to it:

So I have to go to Structure > Views, find that View, load it up, then find the relevant block display within that View... (or go back to a page on the front end that the View block shows up on and use the Contextual links to edit the View).
Suggestion It would be very nice to have an "Edit View" link in the drop list, that jumps directly to the relevant block display within that View automatically.
Recent comments
There is also Node Comments Search - this searches the node and all comments (default search is node and first page of comments) as part of the content search. Izzy's module above is a separate...
Search does not include comments
I have created a new module comment_search
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If there is no response, alternatively, you can use a View with a list of comments, with a filter based on the comment text. I haven't tried it myself, I just got an idea.
Search does not include comments