Image Editor 'Multichannel View' mode (RGB+Alpha, RGB, Alpha, R, G, B, all at once)

As having to check or compare the different channels of images such as, say, a channel packed texture image, is rather cumbersome, I propose that, the same way the 3D viewport has a Quad View mode, the Image Viewer ought to have a Multichannel View mode.

It would show two rows of three images each:

• Top Row: RGB+Alpha, RGB, Alpha.
• Bottom Row: R, G and B channels.