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Jehan authored
… multiple drawables as parameter. Previous commit 7bb892f3 was "making it work" by making the API inconsistent and also only using the first drawable, which is making the logics meaningless. Instead accept multiple drawables, and export only the selected drawable (when alone) or the merged-down image containing only the selected drawables (when many). Note that in current implementation, this is not useful from GUI calls because the fully merged image is always exported when run interactively or with last vals (i.e. from the GUI) because gimp_export_image() flattens the image. So this change would only work when called non-interactively from other plug-ins. In such a case, multi-layer images do no longer return an error and whatever items are selected would change the export result. See also #7370 for a discussion about how to handle the selected items during export (because currently the `drawables` parameter of GimpSaveProcedure's run function is clearly a mostly bogus parameter).
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