what determines if pressing the wipe-out button or pressing CTRL-x
extinguishes to either the background color or to transparency? I thought the
type of file would. But some png-files I opened behaved so that CTRL-x of a
selected area makes the deleted stuff transparent (which I want), while with
others all I can reach is substituting the selected area by the background
color. How can I force those files to delete to transparency?
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