Sortable flicker when dragging portlets

Hi there

I am using the portlets example from the JQuery sortable website.

We have set the tolerance to "pointer" as below:

$( ".column" ).sortable({

connectWith: ".column",

handle: ".portlet-header",

cancel: ".portlet-toggle",

placeholder: "portlet-placeholder ui-corner-all",

tolerance: "pointer"

});

When dragging a widget over another widget which is off the top off the page, the widget and page flickers very fast.

This issue happens in the Chrome browser (Version 62.0.3202.94 (64-bit))

The flicker is still there when tolerance is set to "intersect", but a lot less noticable.

Is there any scroll offset we need to add to stop this occurring?

Any help would be greatly appreciated?

(Video to recreate this issue is attached.)

Regards

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