"Xfce 4.14", [Alpha] panel opacity 'fix'...

Here i describe - at least 'in-words'[!] - the alpha 'fix' described. "rjl6789" posted the fix for me, much obliged.
PS If nothing else, my 'issue' when using 'compositing' is clearly seen.
I think it is likely down to my use of "SSR" when making the video..?
Thanks for watching...