Extend droppable area when there is empty space below a thought

[raineorshine]

If there is empty space below a thought, extend the droppable area of the drop target to make it easier to drop where desired.

Steps to Reproduce

- a
  - b
    - c
    - d
- x

1. Set the cursor on d
2. Drag c and drop it below d

Current Behavior

There is a very small amount of space differentiating the x, a, and b drop targets, making it hard to choose the correct one.

Expected Behavior

We should take advantage of the empty space and increase the size of the drop targets at the bottom of the visible thoughts.

• Extend the height of b and d by 1em.
• Extend the height of a by 1.2em
• Extend the height of x by 1.4em
• etc

There can only be one child (d) and one sibling (b), but many cliff drop targets (x and a).

[Zubair286]

Let me confirm, we need to increase the height of DropEnd relative to the depth starting from deepest like band d, do I understand this right?

[raineorshine]

I'm not sure exactly if it's DropEnd, but yes, the height of the drop targets at the cliff should be increased relative to depth.