Sourcecode plugin: codearea is resized to thumbnail size and pageview freezes

[Hjalmar Boulouednine]

zim version: 0.63
python-gtksourceview2 (2.10.1-2build1)
libgtksourceview2.0-0 (2.10.5-2ubuntu1.1)
Gtk version is (2, 24, 27)
Pygtk version is (2, 24, 0)
OS: kubuntu

Description:
Inserting a source-block works, but when i open the page again the block is resized to a thumbnail size and i can't edit the
page anymore. The problem is solved when i use tools> update index. After doing that the page shows normaly and is editable.
But when i reopen the page again, also the problem occurs again.

maybe this is usefull to:
DEBUG: Insert object(<TextBuffer object at 0x7fc5e2ee4140 (zim+gui+pageview+TextBuffer at 0x159aaf0)>, <Element 'object' at 0x7fc5e2ed1ba0>)
/usr/lib/pymodules/python2.7/zim/gui/widgets.py:188: GtkWarning: gtk_scrolled_window_add(): cannot add non scrollable widget use gtk_scrolled_window_add_with_viewport() instead
  window.add(widget)