intellihide: Fix unexpected unredirection disable with overview #2196
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When overview shows, this._animateIn is called in
_onOverviewShowing(). And when overview hides, _updateDashVisibility() might call this._animateIn() again, which makes the unredirection always disabled and brings performance issue in some cases.
This commit replaces the counter for unredirection by a boolean value, to make logic more clear, and disabling/enabling unredirection balanced.
Fixes #2192.