Fixed invisible labels in the menu editor.
* gladeui/glade-editor-property.c: Fixed invisible labels in the menu editor. * gladeui/glade-widget.c, gladeui/glade-widget.h, gladeui/glade-xml-utils.c, gladeui/glade-utils.c, gladeui/glade-xml-utils.h, gladeui/glade-utils.h, gladeui/glade-property.c, gladeui/glade-property-class.c, gladeui/glade-property-class.h, gladeui/glade-project.c, gladeui/glade-project.h: implemented "factory-stock-id" in the catalog, this allows you to take a resource image file property formerly hacked as a custom property in libglade, and glade will generate a hidden icon factory in builder files so that it will be loaded through the stock system instead, "factory-stock-id" depicts the name of the stock property of the property-class in question. svn path=/trunk/; revision=1796
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