Use dibv5 bitmap format for clipboard. #29
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Fixes transparent background when pasting an image from clipboard in some apps by providing a DIBV5 format image as a secondary option.
(the only app where this doesn't seem to work is Telegram Desktop, Qt has some weird quirks regarding DIBV5 and it will still prefer the "PNG" version with broken alpha)
Also the native Clipboard class does not support DIBV5 natively (it tries to make a "Compatible" DIB with broken alpha) so I used DllImport.
Example pasted from clipboard:
