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Murray Cumming authored
* glom/mode_data/buttonglom.[h|cc]: * glom/mode_data/datawidget/checkbutton.[h|cc]: * glom/mode_data/datawidget/combo.[h|cc]: * glom/mode_data/datawidget/combo_as_radio_buttons.[h|cc]: * glom/mode_data/datawidget/datawidget.[h|cc]: * glom/mode_data/datawidget/entry.[h|cc]: * glom/mode_data/datawidget/label.[h|cc]: * glom/mode_data/datawidget/textview.[h|cc]: * glom/utility_widgets/imageglom.[h|cc]: * glom/utility_widgets/notebookglom.[h|cc]: get_appwindow(): This should be const because the pure virtual function (that it is meant to override) is const. This fixes warnings found by clang++.
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