Export batch with no boxes checked overwrites same file repeatedly

[cmeyer]

When the user is exporting a set of files by selecting multiple display items and then choosing File > Export, the user is presented with a dialog that allows them to set the file naming template.

If they deselect all items, or if the combination of check boxes results in duplicate filenames, the export procedure simply overwrites the earlier export with the same filename.

Tasks

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1. Rewrite do_export in ExportDialog.py to its own function external to the ExportDialog class
2. In do_export, generate a map of display items to filenames, ensuring a unique filename for each display item
3. Extra credit: Rewrite ExportDialog to use declarative (see how ExportSVGHandler does it)
4. Extra credit: Move the functionality of do_export to a Action in DocumentController.py for scriptability, testing

[cmeyer]

XY reports "If I export multiple data with the same name (e.g. NionCCD-1010), only one file can be saved. I can check "Include Sequence Number" to allow them all to be saved. However, could you make this batch export smarter to automatically add sequence numbers if several items use the same file name."

[cmeyer]

The UI for the batch export resides in ExportDialog.py.

Once the user has configured the options, the do_export method loops through the selected display items and exports them to a file using write_display_item_with_writer.

[cmeyer]

Fixed 907bf56

[Ion-e]

Issue verified as working correctly.

Thanks!