Improved search navigation suggestions

[iconoclasthero]

Is your feature request related to a problem? Please describe.
Use case: I listen to audiobooks and that's about it in terms of consuming books. There are instances like today where I remember a quote from e.g., Shantaram that I want to discuss at a meeting later. I read the book a while ago and I'm trying to key in on a relatively common word, e.g., feeling and then look for the passage from there. There is apparently no way to navigate the results other than to repeatedly open and close the search window...which is a PITA. Foliate lacks a straightforward forward/backward navigation common to mosl search features...either using the search menu or a keyboard shortcut.

Describe the solution you'd like
A keyboard shortcut to move back and forth on the search resultslist.

Describe alternatives you've considered
Not using Foliate to do this. I could export to text and grep or use nano... I mean vim does this too, but I don't use that.

Additional context

[iconoclasthero]

Oh, I just noticed that you can use / to get to the search window.
Potentially an easier fix is to do this...
/ then have the cursor on the last selected search result instead of in the search box... ot make that e.g., ^/ or shift-/...
anyway, instead of in the text box and then you can use the arrow keys to go to the next/previous hit.

hey, it's time to do something with 22.04, so looks like I'll be able to compile Foliate once I do.

[iconoclasthero]

So upon more investigation, / ↑ will get you to the list and then from there you can navigate with ↑/᪳᪳↓. If you use / ↓ you're stuck at the radio button. I assume you don't have a choice on navigating down from the button, but if you could change that, that would be an improvement.

tldr: Found a workaround; an actual keyboard shortcut without having to go back to the search box would be preferred.

[johnfactotum]

Duplicate of #693.

In v3, you can use CtrlG and CtrlShiftG.