in master branch, using Colors > Desaturate (luminosity) and Image > Mode > 
Grayscale on a RGB image (whatever the image precision) gives different results.

This does not appear in branch gimp-2-8, since the 2 actions are computed the 
same way (using GIMP_RGB_LUMINANCE).

In master, for Desaturate (luminosity) filter, GIMP_RGB_LUMINANCE is used on a 
R'G'B'A buffer.
For Grayscale conversion, drawables' buffers formats are converted to 
babl_format Y (or Y' according to the initial format).

As these 2 actions seem to have the same goal (obtain the relative luminance), 
shouldn't we obtain the same result ?

Thomas Manni
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