Method _goBack

src/helpViewer/panel.ts:214–223

(currentScrollY = 0)

    }
    private _goBack(currentScrollY = 0): void {
        const entry = this.history.pop();
        if (entry) {
            if (this.currentEntry) { // should always be true
                this.currentEntry.helpFile.scrollY = currentScrollY;
                this.forwardHistory.push(this.currentEntry);
            }
            void this.showHistoryEntry(entry);
        }
    }
    public async goForward(): Promise<void> {
        const scrollY = await this.getScrollY();
        this._goForward(scrollY);