Copying text (sometimes) removes new lines

[MasterCassim]

Copying text from the tower's code box sometimes removes new lines.

[Jarek Głowacki]

Editing posts removes the last newline from inside code tags. This last new line is needed else the last keyword in those code tags won't get highlighted. But that's just a triviality :) It also seems to remove '<' and '>' signs from inside code tags (but leaves '<=' and '>=' as they are).

[MasterCassim]

bugfix #2

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