Cancel previous scroll if the new to-be-scrolled tab is in the viewport
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@ -6654,7 +6654,11 @@ TreeStyleTabBrowser.prototype = inherit(TreeStyleTabWindow.prototype, {
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scrollToTab : function TSTBrowser_scrollToTab(aTab, aOnlyWhenCurrentTabIsInViewport)
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{
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if (!aTab || !aTab.parentNode || this.isTabInViewport(aTab))
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if (!aTab || !aTab.parentNode)
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return;
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this.cancelPerformingAutoScroll(true);
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if (this.isTabInViewport(aTab))
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return;
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var b = this.mTabBrowser;
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