src/vs/editor/browser/viewParts/viewCursors/viewCursor.ts/ViewCursor/_getGraphemeAwarePosition
class ViewCursor:	private _getGraphemeAwarePosition(): [Position, string] {
		const { lineNumber, column } = this._position;
		const lineContent = this._context.viewModel.getLineContent(lineNumber);
		const [startOffset, endOffset] = strings.getCharContainingOffset(lineContent, column - 1);
		return [new Position(lineNumber, startOffset + 1), lineContent.substring(startOffset, endOffset)];
	}