check wasClean in onclose event #1872
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Chrome does not trigger an onclose if it was caused by a user page navigation/refresh. However, Firefox does trigger the onclose, this results in a confusing message. The wasClean check avoids this.
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Chrome does not trigger an onclose if it was caused by a user page navigation/refresh. However, Firefox does trigger the onclose, this results in a confusing message. The wasClean check avoids this.