allow web worker resource to be relative

[astraw]

Description

This PR allows a web worker resource (the .js and _bg.wasm files) to be specified relative to the loading path. Prior to this PR, the resource is specified with an absolute path. In this case - with an absolute path - if the resource is specified at "location.js", the path "/location.js" will be used.

As discussed in #2056, this adds a new method name_of_resource_is_relative to the trait yew_agent::Agent. The default implementation returns false and the current behavior - to specify an absolute path - remains unchanged. What is new here is that if an implementation implements this method and returns true, the location of a web worker script is interpreted as relative to the current path.

Fixes #2056.

Checklist

• I have run cargo make pr-flow
• I have reviewed my own code

[astraw]

I didn't notice the MSRV of 1.49. I'll fix this.

[mc1098]

A suggestion from me regarding re-implementing a std fn not yet available in MSRV.
Also admission that your naming is better than mine :)

[lausek]

Hi @astraw, could you please review the suggested changes to make this PR mergeable?

[astraw]

I think this should be good to merge. However, Github shows me "Changes requested" although I thought I have now implemented all requested changes as far as I can see. Probably it is something with the Github PR UI that I do not understand, as I am not very familiar with it. Anyhow, it would be great if you would check this again and merge if you find appropriate.

(Apologies for the delay, the last weeks have been busy.)

[mc1098]

Github shows me "Changes requested" although I thought I have now implemented all requested changes as far as I can see.

It doesn't change until the person who made the request for changes approves of those changes :)

Thank you for changes 🎉 LGTM.

@voidpumpkin second pair of eyes please 👀