Debug this...

sp.ui.dialog.debug.js

autoSize: function() {ULSTYE:;
    var $v_0 = 0;
    var $v_1 = 0;
    this.$Q_0((SP.ScriptUtility.isNullOrUndefined(this.$G_0.width)) ? 500 : this.$G_0.width, (SP.ScriptUtility.isNullOrUndefined(this.$G_0.height)) ? 20 : this.$G_0.height);
    if (this.$0_0) {
        try {
            var $v_2 = this.$0_0.contentWindow.document;
            var $v_3 = $v_2.getElementById('s4-ribbonrow');
            var $v_4 = $v_2.getElementById('s4-workspace');
            if ($v_3 && $v_4) {
                var $v_5 = $v_4.style;
                var $v_6 = $v_3.style;
                var $v_7 = $v_5.width;
                var $v_8 = $v_5.height;
                var $v_9 = $v_6.width;
                var $v_A = $v_6.height;
                $v_5.width = '';
                $v_5.height = '';
                $v_6.width = '';
                $v_6.height = '';
                $v_0 = Math.max($v_3.offsetWidth, $v_4.scrollWidth);
                $v_1 = $v_3.offsetHeight + $v_4.scrollHeight;
                $v_5.width = $v_7;
                $v_5.height = $v_8;
                $v_6.width = $v_9;
                $v_6.height = $v_A;
            }
            else {
                var $v_B = $v_2.getElementById('ms-notdlgautosize');
                if ($v_B) {
                    $v_0 = parseInt(SP.Res.defaultDialogWidth);
                    $v_1 = parseInt(SP.Res.defaultDialogHeight);
                }
                else {
                    $v_0 = this.$0_0.contentWindow.document.body.scrollWidth;
                    $v_1 = this.$0_0.contentWindow.document.body.scrollHeight;
                }
            }
        }
        catch ($$e_2_0) {
        }
    }
    else if (this.$E_0) {
        $v_0 = this.$E_0.scrollWidth;
        $v_1 = this.$E_0.scrollHeight;
    }
    $v_0 += SP.UI.Dialog.$1b_0();
    $v_1 += SP.UI.Dialog.$1b_0();
    if ($v_0 < 50) {
        $v_0 = parseInt(SP.Res.defaultDialogWidth);
    }
    if ($v_1 < 20) {
        $v_1 = parseInt(SP.Res.defaultDialogHeight);
    }
    if (SP.ScriptUtility.isNullOrUndefined(this.$G_0.height)) {
        this.$A_0 = $v_1;
    }
    if (SP.ScriptUtility.isNullOrUndefined(this.$G_0.width)) {
        this.$B_0 = $v_0;
    }
    this.$Q_0(this.$B_0, this.$A_0);
}