Node panel tab size is often excessive

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Describe the Bug

1. Open random world
2. Add OfficeChair and select it.
3. Select the mass tab. It's fairly big, so an horizontal scroll should appear
4. Select any of the other tabs, they all maintain this wide area despite their content being significantly smaller

The node panel's size should fit the content of the active tab, not the one of the biggest among them. It's likely similar to the issue where long Importable Externproto lists affected all other tabs (vertically in that case, horizontally in this).