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The applications still need to retrieve data for the clipboard to be of any use to anyone. E.g. Editor widgets like to have a paste button. Edit > Paste is a fairly common pattern, too.

Without having the OS in charge of managing the entire UI, it's difficutlt to make that work

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OK, but pasting should be triggered by an user action.

Aside from Clipboard managers (which should be handled like on screen keyboard or other alternative input methods) I don't see a reason to allow pasting (and so reading from the clipboard) from an window that doesn't have the input focus.

That's a good step, but I think in most windowing systems, windows can just take and give focus as they please, so that alone probably wouldn't be too effective.

It's probably a possible problem to solve, but fixing stuff that wasn't build with security in mind from ground up is always tediuos.

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