Problem:

• CT raid frames do not touch each other, even when v- or h-spacing are set to zero.

Suggested solution:

• Permit negative spacing to cancel out the effect of borders.

Discussion:

• Frame backdrop borders in 8.0 and earlier will shrink the visible are of the frame, because the borders include a transparent outer edge that expands based on the edge size
• Backdrop borders are changing in 9.0, so this change makes sense to implement in 9.0.0.1

Reference:

• Originally requested at Curse by meltar42.