Examples: async request no blocking main thread

[Claudio-code]

Tried fix it #853

• Make async web request to pokeapi and list all in window
• When scroll to end make new request and add new pokemons in list

[bilelmoussaoui]

Thanks a lot for your contribution, please send a PR to add the needed dependencies to https://github.com/gtk-rs/gtk4-rs/blob/master/Dockerfile.

But before doing so, the other option is to disable the default features of reqwest and use rustls-tls instead. That will make the example easily runnable on other platforms like windows

[bilelmoussaoui]

overall looks good, few things though:

• Add a readme for the example
• The gif example is nice, but please record just the application window without anything else (to reduce the size) and using a light default theme to match all the other examples. The current gif is too large (1.18mb).
• Please rename the gif to something like screenshot.gif
• Add the example to the main examples/README.md

[bilelmoussaoui]

You could derive Default and use that instead

[bilelmoussaoui]

We are removing once_cell usage from our crates, so you should use std::sync::OnceLock here instead

[Claudio-code]

I couldn't do this and it ends up giving errors because of the listbox, but if you instantiate it within the lambda there is no way for the ScrolledWindow to receive its value. Can you show me an example of what this implementation would look like?

error:

[Claudio-code]

I achieved resolve

[bilelmoussaoui]

Looks good to me! Still not a fan of the gif, but I will update that later to have a consistent look across the examples.

Thank you for your contribution