Registered decorations onRender can fire event containing the overview-ruler element

[Tyriar]

I added this code to VS Code:

		const decoration = this._terminal.registerDecoration({
			marker
		});
		if (decoration) {
			decoration.onRender(element => {
				console.log('element', element);
				element.style.backgroundColor = 'yellow';
			});
			timeout(2000).then(() => decoration.dispose());
		}

And I see a yellow scroll bar:

And these logs:

[meganrogge]

That was intentional because we should leave it up to embedders to use this element or filter it out as needed.

[Tyriar]

Rendering for the overview ruler is totally controlled by xterm.js so the embedder shouldn't ever need to touch it, it also makes the API harder to understand/use imo.