Text editor panel freezes when deselect a code block

[datross]

Zim version : 0.65 (bug also present with 0.62)
OS used : Linux (Ubuntu)
Gtk version is (2, 24, 27)
Pygtk version is (2, 24, 0)
----------------------------------------------------------------------------------

Content of the file which triggers the bug (it's just an example) :

Content-Type: text/x-zim-wiki
Wiki-Format: zim 0.4
Creation-Date: 2016-04-07T23:18:42+02:00

{{{code: lang="cpp" linenumbers="true"
int main() {
 printf("Hello");
 return 0;
}
}}}

---------------------------------------------------------------------------------

Description of the bug :

After creating a code block (with code block add-on), if you move to another file, when you come back to the original file, the text editor panel freezes (you can't edit text). The bug appears only for the concerned file, you can always switch between files etc (because only the editor panel freezes, and only for this specific file).
When the editor get frozen, you just need to resize the window the solve the problem.

[Alexander Mescheryakov (alexander-s-m)]

I'm pretty sure it is a duplicate of https://bugs.launchpad.net/zim/+bug/1460386