Comment 2 for bug 1747653

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Wayne Stambaugh (stambaughw) wrote : Re: Edit Environment variable: small letters not visible

You should hear a beep when typing invalid characters in to the edit control unless your sound is off. I've never seen a text entry show invalid characters while your typing. I don't think it's a good idea to change the behavior to show red invalid characters while typing so this is unlikely to get fixed.