Weird padding when a bookmark folder only has one item

[ironveil]

Describe the bug
When a folder only has one bookmark (like the image below), it has some weird padding on the bottom.

To Reproduce

1. Create a folder.
2. Add a single bookmark inside this folder.
3. Look at the weird padding

Expected behavior
The padding should be equal on all four sides rather than being weirdly-big on the bottom.

Screenshots

Setup information

• OS: Arch
• Installation method: cURL script
• Firefox version: 124.0.1-1
• Theme version: v122
• Optional features enabled: gnomeTheme.hideSingleTab, gnomeTheme.bookmarksToolbarUnderTabs

[rafaelmardojai]

This is caused by:

firefox-gnome-theme/theme/parts/popups.css

Line 28 in 3301531

min-height: 60px !important;

Which is a workaround for #729.

I need to figure out a better way.