I reproduced this now by trying to set a dimension of 100x100 for the browser window. Whereby the absolute minimal size can be width=335px, height=121px on my system. As such we are trying to resize but never get a resize event. As such the DebounceCallback never gets run, and early exits. Maybe we need a maximum expected time until the first event should actually happen. And if that is not the case bail out.
Bug 1478358 Comment 7 Edit History
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I reproduced this now by trying to set a dimension of 100x100 twice for the browser window. Whereby the absolute minimal size can be width=335px, height=121px on my system. As such we are trying to resize but never get a resize event. As such the DebounceCallback never gets run, and early exits. Maybe we need a maximum expected time until the first event should actually happen. And if that is not the case bail out.