Support of disabled item within WComboBox
I would like to have a setItemDisabled(int index, bool disable) method within WComboBox class. Thus an user cannot select such a disabled item from the WComboBox. The attached screenshot is from a Trac Custom Search page which shows this feature.
To implement this I would add a Wt::ItemFlag::ItemIsDisabled and add support for it within the WStringListModel (maybe a member std::vector disabled_?). Within the WComboBox class the updateDom() method should then set the PropertyDisabled if the item is disabled.