Comment 3 for bug 1510421

The patch will automatically look for the old "thumb.png" file, so it should be automatically compatible with block plugins that haven't been upgraded for 15.10.

It also provides 3rd-party developers with the option to name a specific FontAwesome icon they want to use for their block.

The easiest way to test it, is to install a 3rd-party plugin using the old & the new method. I've updated my Clippy blocktype with a couple of branches for this purpose:

Clippy with the "legacy" thumb.png: https://github.com/agwells/maharacontrib-blocktype-clippy/archive/Bug1510421-thumbnail.zip

Clippy with a FontAwesome icon (a paperclip): https://github.com/agwells/maharacontrib-blocktype-clippy/archive/Bug1510421-fontawesome.zip

To test:

1. Install Mahara
2. Download the clippy plugin with the legacy thumbnail, and install it into htdocs/blocktype/clippy
3. Go to the admin screen and install the clippy plugin
4. Log in to Mahara and edit a page. Look for the clippy icon in the "General" blocks category. You should see the small, in-color Clippy icon.
5. Delete the contents from htdocs/blocktype/clippy and replace them with the version of clippy with a FontAwesome icon
6. Log back in to Mahara and edit a page. Look for the clippy icon in the "General" blocks category. You should see a black-and-white FontAwesome paperclip icon.