src/vs/workbench/contrib/terminal/browser/terminalTypeAheadAddon.ts/PredictionTimeline/tentativeCursor
class PredictionTimeline:	tentativeCursor(buffer: IBuffer) {
		if (!this._tenativeCursor) {
			this._tenativeCursor = this.physicalCursor(buffer).clone();
		}

		return this._tenativeCursor;
	}