Set QMessageBox icon to application icon
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IMHO the warning and critical icons should be used very sparingly in order to avoid overloading the user with messages that might make him/her panic.
The question and information icons are non-standard (?) and look a bit clunky.
99 times out of 100 I want to show no icon or the application icon.
I think the Apple HIG says something similar to what I'm saying.