Transparency not working since upgrading to 4.18
Was reported in 672 but was closed by OP. I'm opening this as I still face the issue regardless of the compositor used be it the built in xfce compositor, Compton or picom.
To obtain transparency in the panel I need to add the following to xfce auto start: xfce4-panel -r
If I don't all I get is a solid colour panel or one with what ever image I select. Additionally if I set the colour to an alpha channel colour It remains black and if I set it to use an image that is just transparent it remains black.
Many have thought this was a compositor issue but it is not because all that is needed to resolve the issue is to restart the panel and kill/replace the old one.
Keeping xfce4-panel -r is a workaround that should not be required for normal operation.