The color picking reads 3 channels from a 4 channel texture. In the
common case the data conversion is required. Data conversion happens on
all 4 channels, but the backed memory only has 3 channels.
This is a workaround as the actual solution needs to work in many
different situations. Previous solution had to many issues that we
reverted the solution. This PR adds a local workaround specific to color
picking.
In Blender 5.0 we want to add test cases for all situations and
implement a solution that works better.
Pull Request: https://projects.blender.org/blender/blender/pulls/140101
cffafda2ff