Prevent infinite looping in target callbacks #459
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Prior to this change, adding or removing target elements could result in an infinite loop of callbacks and mutations. This commit introduces `ElementObserver.pause()` (and transitively introduces `AttributeObserver.pause()` and `TokenListObserver.pause()`) to provide callers with the ability to pause and resume mutation observation. When firing `[name]TargetConnected` and `[name]TargetDisconnected` callbacks, the behind-the-scenes observers are paused.
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Prior to this change, adding or removing target elements could result in
an infinite loop of callbacks and mutations.
This commit introduces
ElementObserver.pause()(and transitivelyintroduces
AttributeObserver.pause()andTokenListObserver.pause())to provide callers with the ability to pause and resume mutation
observation.
When firing
[name]TargetConnectedand[name]TargetDisconnectedcallbacks, the behind-the-scenes observers are paused.