Think everyone learned this time around. France included. IMHO, I believe the French didn't expect us to follow through on the threat to attack Iraq.
Maybe they made promises to Saddam? Just speculation.
I think the Americans and the French have learned how to work with each other again. Lebanon was really the testing ground. Also, the best counterterrorism outfit in the world is run from Paris, and the US and France have been closely cooperating on that since 9/11.
The US is in the position where it's out of gas. The US Congress isn't going to authorize an invasion of either Syria or Iran. So, we're in the world of posturing now.
If the US postures alone, it will damage the US credibility, because the Americans are in no position to act.
Iran's regime vis a vis France is a bit like Cuba's vis-a-vis the USA, partly because there is such a huge post-Revolutionary Iranian expatriate population in Paris.