+1, thanks! This is required for D12508: Make KMessageWidget match Kirigami inlineMessage's style

Thanks for bringing this up - I'll give it a look; designer has a bad habit of changing more than needed. I wonder if adding a notice in the profile name box would be simpler.

Unless someone objects, I'm going to remove this warning and just use the QLineEdit's placeholderText

_ui->profileNameEdit->setPlaceholderText(i18n("A profile name must be entered!"));

Are we sure that would have enough visibility to avoid being missed?

That crossed my mind that it would be nice to have a red border/background but that doesn't appear simple to do. Regardless, you can't apply/save w/o a name; there's popup dialogs if you try.