Verified-fixed on latest Nightly 77.0a1 (2020-05-04) on Windows 10 and MacOS 10.13. The field will get a red highlight after pasting in a string that is longer than the maxlenght. Can also confirm the regression Bug 1635224.
Bug 1320229 Comment 24 Edit History
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Verified-fixed on latest Nightly 77.0a1 (2020-05-04) on Windows 10 and MacOS 10.13. The field will get a red highlight after pasting in a string that is longer than the maxlength. The warning highlight is also dismissed if the user shortens the length to the maximum value. Can also confirm the regression Bug 1635224.