Offer worldwide search when zoomed far out

[slhh]

The sidebar is empty when zoomed far out, we should better show a searchbox for the already existing worldwide search instead. We have space to place some instructions here to make OSM-id or coordinate search discoverable.

[bhousel]

Good idea!

[leegenes]

Is this still something you all hope to implement? Happy to work on this if someone can point me in the right direction [i.e. toward the right modules].
In the meantime, trying to familiarize myself with the code. Pretty new [almost brand new] to open source world.

[bhousel]

Yes @leegenes we'd love help with this!

The code for the "Zoom in to edit" message is here: https://github.com/openstreetmap/iD/blob/master/modules/ui/notice.js

That .notice div is styled to fill and cover up whatever it is inside:

iD/css/80_app.css

Lines 3628 to 3636 in af8779a

	.notice {
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	text-align: center;
	background: #fff;
	}

So the search is actually behind that "Zoom in to edit" message, but hidden.

I think maybe a better thing to do would be to move the "Zoom in to edit" message on top of the map itself, instead of filling the sidebar.

👇 remove these lines in sidebar.js, and put somewhere else

iD/modules/ui/sidebar.js

Lines 18 to 19 in af8779a

	selection
	.call(uiNotice(context));

[bhousel]

This was done in #4279, thanks @leegenes!