Add option to copy last detected text to clipboard

[RhetTbull]

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          > How about this, would it be possible to keep a clipboard cache that stores the text of the previous OCR job? I

That's not a bad idea. You could do this with a clipboard management app but it should be easy to add a "Copy last text detection to clipboard" feature and maybe an option to pop up a window with the last detection.

Originally posted by @RhetTbull in https://github.com/RhetTbull/textinator/issues/31#issuecomment-2091124134

[RhetTbull]

Implemented in current feature branch, will be in next release