Show the export configuration widget
Now all we need to do is fix all other export filters other than png to create an export widget, a default configuration setting and use them internally, too, instead of hard-coded dialogs in the export method. Note: we might also need a currentConfiguration() method in KisImportExportFilter. We'll need to pass the configuration to KisImportExportManager all the way down to the actual filter. And when the split-up is really done, we can make it possible to pass a filter config file on the command-line for the conversion system.
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