Hello @coderwassananmol
Great commit, bro!

Can I give you a better approach?

As explained here, the problem occurs because the part of the code which calculates the content's height is not considering the presence of the filter.

Check the file _popup.js, line 170. There, you can see that the content's height is calculated based on popup's height and the title's height.

If the select has a filter (remember: there is a parameter saying that, default is false), we should consider the filter too. The solution would be something like that:

let popupHeight = _calculatePopupHeight();
let titleHeight = _$title.outerHeight();
let filterHeight = _$filter.outerHeight();

let contentHeight = (popupHeight - titleHeight);
if(_properties.hasFilter)
	contentHeight = contentHeight - filterHeight;

_$content.outerHeight(contentHeight);

You must check if the hasFilter is true because even when the filter field is not visible, it has the size 44px. It's because its visibility is controlled by display: none and not something like height: 0

Brilliant @StanleySathler
I have updated the patch. I hope this works!

Yay! Very excited with the contribution, @coderwassananmol. Already merged. 🔥