src/vs/editor/common/viewLayout/linesLayout.ts/LinesLayout/isInTopPadding
class LinesLayout:	public isInTopPadding(verticalOffset: number): boolean {
		if (this._paddingTop === 0) {
			return false;
		}
		this._checkPendingChanges();
		return (verticalOffset < this._paddingTop);
	}