As best I can tell, this is a bug in the firmware that's a result of the old static overhang size, where it would dim the content area, but not the overhang. There are two possibilities to workaround it that I can think of...
- Use "EnableOverlay(True)" so nothing is dimmed (not available on roOneLineDialog).
- Use a combination of roImageCanvas and EnableOverlay(True) to draw your own dimmed overlay prior to displaying the message dialog (again, not available for roOneLineDialog, but you could potentially just draw the canvas over the undimmed area).
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