The frame parameter 'alpha

[Seiji Zenitani]

Hi,

I noticed that the frame opacity behavior has been changed.

If the user sets
  (set-frame-parameter nil 'alpha '(nil 60))
the frame opacity remains opaque (100%).
Then, when the user selects another frame
emacs changes the frame opacity to 60%.
However, when the user selects the original frame again,
the frame opacity remains to be 60% because emacs does nothing.
So, the active alpha nil has two different states.

Previously, nil was similar to "default" values.
In the case of active alpha nil, the frame always remains opaque.
In the case of inactive frames, nil means "the same as active frames".
I prefer the previous behavior.  Any idea?

-- 
Seiji Zenitani
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