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.