Originally Posted by Boevis
Spellcasting interrupts auto attacks for Druids, so does weapon/idol swaps.
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Just adding to this a bit:
In general any spell will interrupt your swing timer, with Shamans and Paladins being able to cast instant cast spells without interrupting their swing timer. You could also view the instant abilities of Rogues, Warriors, Cat Druids and Bear Druids to fall under the 'does not interrupt your swing timer' rule.
I'm not entirely sure about Hunter melee abilities, but there is the well known effect on their instant shots delaying an auto-shot if cast in 0.5 second window before an auto-shot would fire. Steady Shot is also pretty much the sole exception, being a 'spell' with cast time which does not reset your 'swing' timer.