Subitems would get cropped or disappear on vertical navigation #1491
Description
I am using Pattern Lab Node v6.0.1 on Mac, with Node v14.21.2, using a Vanilla Edition.
Expected Behavior
All navigation items would open and get displayed correctly in vertical navigation orientation mode even when either including a huger amount of sub-entries or with a limited height but at least 640px width viewport.
Actual Behavior
When there are either too many subitems or the viewport height is decreased, some items currently are being cropped in vertical navigation display mode, compare to e.g.
Steps to Reproduce
Open https://patternlab-handlebars-preview.netlify.app/?p=all and reduce the viewport height e.g. by opening developer tools. If you now open the subitems and its subitems of atoms you would recognize that not all of those are being displayed, but either cropped or even the whole subitem would disappear.