Switching between Editor and Wiki Markup containing at least two links will cause second link to add new line space

When there are at least two links located at newline each, like the pattern below:

[Link 1]
<new line>
[Link 2]
<new line>
Any text here

Switching between Editor and Wiki Markup, a new line space will be added. This scenario will only happens, when there is a line space in between the links.

Step to reproduce the bug:

1. Use Firefox (I'm using version 3.6.3) and create a page, then paste the following into the editor:

   [link 1]
   
   [link 2]
   
   [link 3]
   
   Any text
   

2. Switching between Editor and Wiki Markup to reproduce the bug.

NOTE: This bug does not happen in IE8 and Chrome internet browser.