libgimpwidgets: add "layout" property to GimpIntComboBox
The "layout" proerty controls the combo-box layout (but not its menu layout), and can be one of: - ICON_ONLY: Only show icons. - ABBREVIATED: Show icons and abbreviated labels (or full labels, when there is no abbreviation). - FULL: Show icons and full labels. Default. Avoid reconstructing the combo's cell-layout when the menu is shown/hidden, by maintaining the combo's cell-layout and the menu's cell-layout separately (probably a terrible hack, but one we already use :P).
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