[AlertDialog] forceMount causes document body scroll-locked even when AlertDialog is closed

[seedy]

Bug report

Current Behavior

I want to animate AlertDialog entering and closing, therefore I was planning on using forceMount prop.

Document body is scroll-locked when applying forceMount to AlertDialog's Portal sub-component, even when the dialog is closed.

Removing forceMount from Portal successfully fixed the behaviour, therefore I'm convinced there's an issue between forceMount and scroll-locking behaviours.

Expected behavior

Document body should not be scroll-locked when the AlertDialog is in closed state.

Reproducible example

Codesandbox repro

Suggested solution

Conditionally apply the scroll-locked behavior on open, instead of on mount of AlertDialog.

Additional context

Your environment

Software	Name(s)	Version
Radix Package(s)	@radix-ui/react-alert-dialog	1.1.1
React	n/a
Browser	n/a
Assistive tech	n/a
Node	n/a
npm/yarn	n/a
Operating System	n/a

[seedy]

Turns out I can use CSS-only animations for my use-case.
Hence, that bug is non-blocking to me ! 👌