Fixed nightly with <Show> and <ShowLet>

[maccesch]

I also added <ShowLet> to a few appropriate places in the examples. This way it should be properly tested in the future.

This should fix #4254 and #4236

[maccesch]

CI seems to be broken still... the errors don't seem to come from my changes

[benwis]

Is this trying to only work in Stable?

[maccesch]

I get why it might look this way. But no, this works now in both, stable and nightly.

The reason to exclude some code on nightly is simply because in nightly signals are functions. That means my two implementations for signals and functions collide. In stable signals are not functions so there we need the extra implementation.

[sabify]

@gbj @benwis, I've seen many times that a PR gets merged without a successful CI run; In case we have a failed CI due to network/unusual issues, please re-run the workflow/job manually.

1. Go to the "Actions" tab
2. Find the failed workflow run associated with your PR
3. Click on the workflow run
4. Click "Re-run jobs" or "Re-run failed jobs" button

[zakstucke]

I think these changes to Show and co would be superseded by #4273 if merged.

After #4273, #[prop(into)] when: Signal<bool> would natively work for true, || true, Signal::derive(|| true) etc.

[maccesch]

I think these changes to Show and co would be superseded by #4273 if merged.

After #4273, #[prop(into)] when: Signal<bool> would natively work for true, || true, Signal::derive(|| true) etc.

That would be very cool!