Python Previewer: Initialize WebView

[theCapypara]

WebView has no init function, which is odd. This might be an upstream bug after all, but I'm really not sure.
This works at least and will continue to work, even if this is "fixed" upstream.

[sonnyp]

I think I'd like to use type_ensure for all dependencies and in every lang support.

WDYT?

[theCapypara]

Sure! Although the question is probably, what types should we ensure then? For GtkSource for example it's probably simple Gtk.SourceView.

[sonnyp]

Hmm does init usually registers all objects? Maybe we do want to use that instead when possible.

There is ensure_types in previewer.vala

[theCapypara]

It's probably still a bit overkill to ensure all types of a library or even a big subset for some of them. I would asume all the libs that have an init to also make sure the types are properly registered, so personally I think using ensure_type(s) only for libs without an init is probably fine.

[sonnyp]

I think using ensure_type(s) only for libs without an init is probably fine.

That's what I had in mind 👍
probably my comment wasn't very clear sorry

[sonnyp]

I'll follow up to harmonize across languages.