Allow separate handling of requests to load a thumbnail and a full-sized image using ImageManager

[ashiagr]

Fixes #11304

This PR allows separate handling of thumbnail and a full-sized image requests on using ImageManager's loadWithResultListener.

To test

• RequestListener's methods
  onLoadFailed
onResourceReady
  are refactored to include the new param isFirstResource in the method signature.

• ImageManager's attachRequestListener passes Glide's isFirstResource param to corresponding RequestListener methods.

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

You can test the changes on this Pull Request by downloading the APK here.

[malinajirka]

Thanks, LGTM 🚢

[ashiagr]

@malinajirka seems like isFirstResource is not the best option to differentiate between thumb and full-sized image. When full-sized image is in the cache, Glide straightaway picks it up next time, ignoring the thumbnail and returning isFirstResource as true for the cached full-sized image.

Can we revert this PR and replace isFirstResource with Glide's model param, it carries the url of the image being loaded?

[malinajirka]

I mentioned it as a joke during the call, but I forgot to check it. I didn't expect Glide's API would have such a weird behavior.

Can we revert this PR and replace isFirstResource with Glide's model param, it carries the url of the image being loaded?

Yeah, SGTM. This PR is closed so we'll need to create a new PR, but it doesn't matter. Thanks!