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Michael Natterer authored
Add GimpCellRendererButton and use it to add a "Save" icon to each row of dirty images. Click invokes the "edit-save" action, shift-click invokes "edit-save-as". Also add a tooltip for the icon button. Involves minor changes to GimpContainerTreeView to allow GimpCellRendererButton to be added, and to allow external "query-tooltip" handlers to run.
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