Method dispose

src/helpViewer/helpPreviewer.ts:121–130

(callListener = false)

        // nothing to do, since file watchers keep everything updated
    }
    public dispose(callListener = false): void {
        this.isPackageDir = false;
        while(this.fileWatchers.length){
            this.fileWatchers.pop()?.close();
        }
        this.isDisposed = true;
        if(callListener){
            this.callPreviewListener();
        }
    }

    // Is only called once as part of the constructor
    // It is expected that this instance will be disposed if this method returns false