[TxMt] No transparency for iPlastic theme in Mojave

[Angelo Varlotta]

Hello,
I've recently updated to Mojave and I noticed that a TextMate theme I 
use called iPlastic doesn't allow a transparency for the background. For 
the same background setting in High Sierra the background now is solid. 
I've tried modifying the theme directly in the Bundle editor and tried 
different color codes for the background entry, which was

background = '#EEEEEEEB';

before the OS update, but I haven't been able to add any transparency. 
Does anyone have suggestions?

Angelo
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