I had a look what Scintilla does with copy/pasting rectangular selections and probably have an explanation for what happens. Scintilla has to distinguish somehow whether the text in the clipboard is a rectangular selection or ordinary lines ending with \n. It does this by placing \0 behind the \n for rectangular selections. So for example

abc\n\0
abc\n\0
abc\n\0

in clipboard is a rectangular selection,

abc\n
abc\n
abc\n

is ordinary selection.

I assume that macOS just doesn't like the \0 characters and drops them which effectively changes the rectangular selection in clipboard into ordinary selection.

Maybe on macOS some other character could be used, e.g. \1, I'm just not sure how hard it would be to make this change in Scintilla.

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