Inserting link with paste doesn't get added to undo stack

## Issue Description

When pasting a link over a word to automagically create a linked word the action doesn't get added to the undo stack. I occasionally miss-select a word (say accidentally also selecting the trailing space or double-clicking the wrong word) and then paste the link. I then realise my mistake and do a quick +z only to have some other action undone instead.

## Steps to reproduce:

- Select word
- Paste link
- try to undo

## Expected Result:

Undo the creation of the link Markdown