By Hiding, I mean the PC has successfully gotten a Stealth check that beats an opponent's Perception / Passive Perception and is hidden from that opponent.
Other than attacking, which automatically breaks Hiding, and voluntarily coming out of hiding by yelling or, per the Hiding paragraph (under the Dexterity ability checks section) in the SRD/PHB, "knocking over a vase" and similar actions, are there any specific actions that will break Hiding?
The same paragraph noted above says:
In combat, most creatures stay alert for signs of danger all around, so if you come out of hiding and approach a creature, it usually sees you. However, under certain circumstances, the DM might allow you to stay hidden as you approach a creature that is distracted, allowing you to gain advantage on an attack roll before you are seen.
The part that says "if you come out of hiding" seems open to interpretation, but from what I can find in the rules only the voluntary breaking/dropping of Hiding, or attacking, will break the effect. I can't find anywhere where the rules say "leaving cover" will cause Hiding to break, nor can I find anything indicating that taking damage from an AOE would have any effect on the Hiding status of a target.
Are there any rules specific situations where Hiding is negated other than what is noted above?
I'd like to see if the sages here might have more insight into this.