Feature-request: More alpha options

Hi,

I would like to ask for a new feature in gwenview (well, actually two),
allowing for more ways to show the alpha channel.

Motivation:
The current way of showing alpha (the checkboard) is very good when you
want to check how the image integrates with a background. But if you
want to analyze the color channels in areas with alpha < 1, the
checkboard changes the original color, tricking the user. Also, if you
want to analyze the alpha channel, to check if it dithers correctly or
if there is subtle alpha in some part of the image it is not easy.

Request:
Add two new modes in gwenview (assignable to shortcuts), that allow
seeing only the RGB channels, or only the A channel.
I attach three images that represent this:
current.png: Current gwenview representation
without.png: 'RGB' channels representation
alpha.png: 'A' channel representation

Thanks in advance.

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