Alpha Channel is ignored on Text Label background

I was trying to add a semi-transparent background to a text label, and discovered that, while the editor will let you set the alpha channel, it ignores the setting (and resets to 255 when you re-open the dialog). Would this be difficult to fix?

Oops, missed that m3tan already reported this: [url]]

Also forgot to mention that I"m using version 3.3.1 on Linux.