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fix(Scope): $broadcast and $emit should set event.currentScope to null
When a event is finished propagating through Scope hierarchy the event's `currentScope` property should be reset to `null` to avoid accidental use of this property in asynchronous event handlers. In the previous code, the event's property would contain a reference to the last Scope instance that was visited during the traversal, which is unlikely what the code trying to grab scope reference expects. BREAKING CHANGE: $broadcast and $emit will now reset the `currentScope` property of the event to null once the event finished propagating. If any code depends on asynchronously accessing thei `currentScope` property, it should be migrated to use `targetScope` instead. All of these cases should be considered programming bugs. Closes #7445 Closes #7523
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