Some interfaces are made for data entry that requires copying a lot of items, and it would be absolutely helpful to have a little Copy to clipboard button instead of highlighting text and copying multiple times. This is especially helpful if: it's a link or an email—this feature will avoid accidentally clicking on them if done manually it's an editable field that usually requires copying than editing—this feature will avoid mistakenly editing the entry As my suggestion title implies, this is a toggle, allowing Interface designers to show or hide this option. It can also show up when hovered.
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