Description of problem:
Being able to set windows as transparent offers some interesting options, but
sadly, when you set the transparency of a window, the state isn't remembered the
next time you open it.
For example, the Send and Receive Mail dialog in Evolution which come up each
time it's opened as solid, regardless of the transparency level set the last
time it was used.
Transparency should be like size (and location) which is remembered when the
window closes and then reused when opened (although sadly location seems to be a
bit of a black art).
Version-Release number of selected component (if applicable):
Try Devil's Pie which can remember and set transparency of windows among other
When an application remembers the size and position of it's window, it's
something the application implements. Either using the session protocol or in
gconf or similar. In other words, it's something the application needs to support.
I would look into DevilsPie as suggested in comment #1.