Semantic Highlight Function minor mode highlights the declaration line of the current function or tag (that is to say, the first line that describes the rest of the construct).
In addition, clicking Mouse-3 on the highlighted declaration line opens a context menu that contains menu items for copying, killing, or narrowing to that tag.
The tag classes highlighted by Semantic Highlight Function mode are
the same ones given by
See Sticky Func Mode.
Toggle Semantic Highlight Function mode in all Semantic-enabled buffers. With an optional argument arg, enable if arg is positive, and disable otherwise.