Select Dropdown inside FloatingWindow is covered up

Dependencies check up

• I have verified that I use latest version of all @mantine/* packages

What version of @mantine/* packages do you have in package.json?

9.0.1

What package has an issue?

@mantine/core

What framework do you use?

Vite

In which browsers you can reproduce the issue?

Chrome

Describe the bug

Opening the dropdown for a <Select> that is rendered inside a <FloatingWindow> may appear to work at first glance (if the <Select> is at the bottom of the <FloatingWindow>) but the dropdown's z-index is lower than that of the <FloatingWindow> and gets partially or completely covered in some cases.

If possible, include a link to a codesandbox with a minimal reproduction

https://codesandbox.io/p/sandbox/mantine-react-template-forked-6pzpmt

Possible fix

Conditionally increase the defualt z-index of a <Select>'s dropdown when rendered inside a <FloatingWindow>.

Self-service

• I would be willing to implement a fix for this issue