Feature Request: Indent all lines to current level when multiple lines are pasted

Let's say I have this list
```
- Item 1 
  - Item 2
  - 
```
and I want to add these items with the caret on the blank line:
```
Item 3
Item 4
```
I want the list to look like this:
```
- Item 1 
  - Item 2
  - Item 3
  - Item 4
```
As of now, the plugin would only do this:
```
- Item 1 
  - Item 2
  - Item 3
Item 4
```