Switching from the WYSWYG Editor's Source tab to the Wiki Editor performs unneeded conversion

Steps to reproduce:
1. Create a new document
2. Edit in WYSIWYG mode (CK)
2.1 (Optional) CTRL+R to hard-refresh the page and get rid of any caching you might have in the browser.
3. Switch to the "Source" tab(/button) of the CK editor
4. Enter some wiki syntax, e.g.

**test** dsadsa //dsadsa//

5. Switch to the Wiki editor (using the dropdown on the page's "Edit" button)

Expected result:
The content in the wiki editor should be the same as the content in the WYSIWYG editor's Source tab.

Actual result:
The wiki syntax gets escaped:

~*~*test~*~* dsadsa ~/~/dsadsa~/~/