**System Information**
Operating system: win10 64
Graphics card: 1050ti
**Blender Version**
Broken: (example: 2.91, default light theme)
Worked: (2.79b)
**Short description of error**
This is how it was in 2.7x when selecting multiple RGB channels:
{F8799378}
In recent versions it misses visual representation of how many channels are selected until changing values to see if slider has been updated (left - nonselected, right - all channels are selected):
{F8799821}
**Exact steps for others to reproduce the error**
# Open default scene
# Go to material tab
# Left mouse click any color slot
# Left mouse click first color channel and hold it
# While holding, slide cursor below to cover all channels