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Disconnect destroyed() signal from all tab widgets in ChoqokTabBar dtor

Frédéric Brière requested to merge fbriere/choqok:fix/choqoktabbar-dtor-disconnect into master

Because the QWidget dtor will delete its children first, it is the responsability of any subclass to disconnect any signal that might be emitted as a result of a child's destruction. Otherwise, that signal could end up attempting to invoke a method on the now-destroyed parent.

The ChoqokTabBar dtor must therefore disconnect the destroyed() signal from all children of its own QStackedWidget.

BUG: 400117

Edited by Frédéric Brière

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