Bug 344684 - Greyscale (no alpha) clipboard brushes are of the wrong type
Add a "mask-only" property to GimpBrushClipboard. When TRUE, only create a brush mask (not a pixmap brush with mask and image). Keep two clipboard brushes around: one classic "Clipboard Image" one to be used as "stamp", and one new "Clipboard Mask" one that turns the clipboard into a brush mask.
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