[Breaking Change] Password text fields shouldn't be multi-line

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Oct 2, 2019, 6:07:54 PM10/2/19

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Flutter allows obscured text fields to be multi-line, but it prevents new lines from being added to the text.

Passwords are typically entered in single-line fields. It doesn't make sense to have a password field with multiple lines.

Another reason is that the web supports obscuring text only on single-line text fields (aka <input type="password">).

Throw if EditableText.obscureText is true and EditableText.maxLines is greater than 1.

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Dec 5, 2019, 3:22:27 PM12/5/19

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For anyone searching for this in the future, the PR that closed the issue and introduced this breaking change was https://github.com/flutter/flutter/pull/42470.