SearchView: use GridView

[danirabbit]

Sets us up for #2272

[leolost2605]

@danirabbit grid view has to be directly inside a scrolled window otherwise these weird bugs appear. This also makes sense because otherwise there would be no advantage of using grid view regarding performance since it won't know which children are visible.
See: https://gitlab.gnome.org/GNOME/gtk/-/issues/6801#note_2148413
I came across the same thing when trying to do the kinda the same😅

[danirabbit]

Oh okay damn. I guess we will have to sacrifice the clamp then haha

[leolost2605]

@danirabbit I started to work on a kind of scrollable pass through a while back that can handle this but idk if that will ever work reliably and I currently don't have a lot of time to work on it 🤷

[danirabbit]

Yeah I think there's other things I can do instead anyways, like clamp the contents of a search item row and set max columns in the grid

[leolost2605]

Can't test rn but code lgtm

[GeopJr]

There's Adw.ClampScrollable specifically for this use-case!

[danirabbit]

There's Adw.ClampScrollable specifically for this use-case!

Omg thank you!