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Every time a property tab is opened, the widgets are allocated again and remain in memory until the software closes.

To reproduce, add debug output to a destructor, e.g., to WPropertyColorWidget::~WPropertyColorWidget and use a module that uses the widget, here, e.g., the isosurface raytracer. Every time you select and deselect the module, an instance of the widget is created.

(from redmine: created on 2011-11-18, closed on 2011-11-21)