rem: if (!("childData" in this) || !this.childData.isLoaded) 
add: if (!("childData" in this)) return;  if (!this.childData.isLoaded) 
context: function sv_scrollto (line, align){    if (!("childData" in this) || !this.childData.isLoaded)    {        /* the source hasn't been loaded yet, store line/align for processing         * when the load is done. */        this.pendingScroll = [line, align];        return;    }    this._scrollTo(line, align);}
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