Color grid issues

• Vertical wrap-around places the cursor at an unexpected position
• Bottom row is unused when the color selection is large enough to require scrolling

• Single added colors sometimes show up outside of the grid area?

added Bug label

changed the description

changed milestone to %2.2.12

mentioned in merge request !2114 (merged)

mentioned in commit 5069e77d

closed with merge request !2114 (merged)