Created attachment 572793 [details] [diff] [review] patch Instead, use a global to store what messages have been sent. As an aside, the documentation for WM_POWERBROADCAST says that several messages with different PBT_APMRESUME* values for wParam can be sent in sequence, which implies the existing code could send multiple notifications. Using a global also prevents this. I'm using a virtual machine and am not sure how to test any of this.
Side note, I'm working on a stand alone service that listens for these and supports observer events and a simple callback mechanism for bug 679240. I plan to move the code for this out of widget. (There's win and mac code currently that can be moved.)