I wouldn't call it an open carry law. More like protection against being charged with open carry if you accidently expose your concealed handgun.
34 It is not a violation of this section for a person licensed to
35 carry a concealed firearm as provided in s. 790.06(1), and who
36 is lawfully carrying a firearm in a concealed manner, to briefly
37 and openly display the firearm to the ordinary sight of another
38 person, unless the firearm is intentionally displayed in an
39 angry or threatening manner, not in necessary self-defense.