Improve copy/paste of tables in rich text editor

Summary

When using the rich text editor with tables, the copy/paste is not user friendly enough. Copy pasting several columns/rows and pasting it in a table will create a smaller table. For example

1. Use Visual mode
2. Copy the following table

   a	b
   c	d

3. Paste it in the X in the below table

   1	2	3	X
   6	7	8

4. Expecting to see

   1	2	3	a	b
   6	7	8	c	d

5. When you paste it though, you will see the following
   
6. However, once you save it, you will get the following instead

   1	2	3
   a	b
   c	d
   6	7	8

Suggestion

Improve the copy/paste abilities in rich text editor visual mode