Greg Spencer c5f108f067
Disallow copy and cut when obscureText is set on TextField (#96233)
Before this change, it was possible to select and copy obscured text from a text field.

This PR changes things so that:

- Obscured text fields don't allow copy or cut.
- If a field is both obscured and read-only, then selection is disabled as well (if you can't modify it, and can't copy it, there's no point in selecting it).
2022-01-07 12:21:59 -08:00
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