Summary: Similar to AphrontFormTextAreaControl. I went with manually specifying the property in each class, as there are only 5 (AphrontFormTextControl is handled in D26195) and other types of inputs do not support the readonly property. Ref T16177 Test Plan: Compare against AphrontFormTextAreaControl. If feeling adventurous, maybe change one of the callers of the input fields to readonly. Reviewers: O1 Blessed Committers, valerio.bozzolan, aklapper Reviewed By: O1 Blessed Committers, valerio.bozzolan, aklapper Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno Maniphest Tasks: T16177 Differential Revision: https://we.phorge.it/D26200