[Cin] BlueBanana and alpha slider

IgorV noticed that alpha slider does not appear to work in bluebanana since ~april 2017 (?) I do not have specific files, I just tried to put jpeg wallpaper on track above video, add BB plugin to track with wallpaper.jpg, and colorpick some color there (so selectin will be visible) sadly moving alpha slider from 100 to 0 in BlueBanana does not have any effect on image in compositor? tried rgba-8, rgba-float, yuva8 (also plain x11 and opengl x11, with and w/o direct method). https://git.cinelerra-gg.org/git/?p=goodguy/history.git;a=history;f=cinelerr... I do not have pkg from that earlier era, but I'll try to compile sources on earlier system snapshot. Might take some time ...