Bug 764024 - Allow to choose fill color when resizing layers and images
Add a GimpFillType argument to GimpItem::resize() and fill type widgets to the canvas and layer resize dialogs. Fill the new parts of the drawable according to fill type in gimp_drawable_resize(). Make sure places that need the old behavior get GIMP_FILL_TRANSPARENT passed by hardcoding it in the GimpItem::resize() implemetations of channel, mask, selection etc.
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