MultiComboBox: N-More shows all items

[d3xter666]

Bug Description

When there are multiple tokens in the MultiComboBox and there's not enough space to fit them all, there's a text "N more".
Clicking on this text does not differ from clicking on the arrow to show all the items.

Expected Behavior

In UI5 clicking on the "N more" text shows a list with the tokenized items only.

Steps to Reproduce

1. Go to https://sap.github.io/ui5-webcomponents/master/playground/components/MultiComboBox/
2. Choose a MultiComboBox with many items and select as many as possible, but not all, so the "N more" text to appear
3. If necessary, shrink the screen

[niyap]

The issue is reproducible in iOS as well

[MapTo0]

fixed with #3931