Copy-Paste doesn't work properly for code blocks

Confluence looses indentation on copy-paste between code blocks.
Steps to reproduce:

1. Create a new document, create two code blocks. Insert indentated text in both of them:

   indentation
     works
       initially

2. Double click in the first code block -> Confluence selects the entire contents of the block.
3. Press Ctrl+C
4. Double click in the second code block -> Confluence selects the entire contents of the block.
5. Press Ctrl+V

Expected result: the two code blocks are now indentical
Actual result: the second code block has the same text, but all of the indentation has been lost (and the font is different as well)

Confluence version: 4.1.9
Browser: Firefox 20
OS: Ubuntu 12.04