Issue #11179: Make Legacy Grid colors independent of layer's transparency
Per Anders Jonsson, the grid colors can have semi-transparency even if the image itself has no alpha channel.
This patch always sets the GeglColor's babl format to contain an Alpha channel, rather than reusing the image's color format.
@ajonsson Hi! I'm not sure if this fully resolves issue #11179 (closed) or just the bug you noted in #11179 (comment 2252769). When you have time, feedback from your tests would be appreciated!
Edited by Alx Sa