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Aaron Wells authored
Bug 1510421 Defines a new static PluginBlocktype method, get_css_icon(), which fetches the name of the CSS icon to use for this blocktype. It returns false by default, which tells the theme to "fall back" to the old thumbnail.png instead. 3rd-party plugins can override this to specify a particular icon to use. All the core blocktypes have been refactored to extend MaharaCoreBlocktype, which uses the blocktype name as the name of the CSS icon to use. I also deprecated the "SystemBlocktype" class while I was at it. PluginBlocktype::get_blocktypes_for_category() now returns both the results of get_css_icon() and the thumbnail.png path, so that themes can decide which they want to use. (And of course thumbnail.png is served via thumbnail.php, so 3rd party themes can provide their own custom image files if they wish.) behatnotneeded: Requires installing third-party plugins to test Change-Id: Idb1ecfc7b21175913708e695788906c11133b0c0
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