It seems that some people got mixed up and starting using "smallicon" instead of "iconsmall" for their icons.

At some point later these two classnames started getting styled seperately.

This has cause a few bugs where several icons in a line may have either class and look odd as a result. These bugs have generally been fixed by changing the class.

The draft http://docs.moodle.org/dev/CSS_coding_style#Selectors states that selectors should have either a hyphen or an underscore as a separator between words. Therefore I propose that all "smallicon" and "iconsmall" classes be changed to "icon-small" in master only and '/theme/update.txt' be amended to inform contributed theme designers of the change.