src/vs/editor/common/viewLayout/linesLayout.ts/LinesLayout/getLinesTotalHeight
class LinesLayout:	public getLinesTotalHeight(): number {
		this._checkPendingChanges();
		const linesHeight = this._lineHeight * this._lineCount;
		const whitespacesHeight = this.getWhitespacesTotalHeight();

		return linesHeight + whitespacesHeight + this._paddingTop + this._paddingBottom;
	}