Need help debugging Phoenix in a application being migrated from Classic

I am already burning my brain for too many weeks!

I am migrating RIDE from Classic wxPython to Phoenix. I have a major bug 
that only happens with Phoenix (and not with 2.8.12.1 and 3.0.2). My branch 
with debugging output is 
https://github.com/HelioGuilherme66/RIDE/tree/wxPhoenix.
The application features a Text Editor and Cell Editor (Spreadsheet like) 
for Robot Framework testing files.
Recommended Setup:
Install robotframework with:
pip install robotframework

Install Phoenix (for example for Python 2.7 in Windows 64bit):
pip install http:
//wxpython.org/Phoenix/snapshot-builds/wxPython_Phoenix-3.0.3.dev2030+028d173-cp27-cp27m-win_amd64.whl
or
Install Phoenix (for example for Python 2.7 in Linux 64bit):
pip install https:
//github.com/HelioGuilherme66/Phoenix/releases/download/v3.0.3.dev2001/wxPython_Phoenix-3.0.3-cp27-none-linux_x86_64.whl

Install RIDE (or get the code) (please see the installation instructions in 
the Wiki <https://github.com/robotframework/RIDE/wiki>):
pip install https://github.com/HelioGuilherme66/RIDE/archive/wxPhoenix.zip

-----
If using the source code, you may run with:
invoke devel
or
python src/robotide/__init__.py


-----

Description of the blocking bug (when running in Fedora Core 22 x64):
1 - Enter a keyword in a Cell, or edit exiting value.
2.1 - If running from installed RIDE (or with PyCharm), there will be an 
"maximum recursion limit" error in RIDE Log.
       But the Cell content is correctly changed.
2.2 - If running from source code, the application will crash with 
Segmentation fault.

If you start editing a Cell but keep the value unchanged, there will be no 
problem.

-----
The CellEditor methods include a feature to look up the imported libraries 
in the Test File and suggest known values (by using Control+Space). The 
problem is when saving the editing to the file context, there is a 
recursive call to the storing methods (the moment we conclude the editing).
Why does this code breaks with Phoenix and not with 2.8.12.1 and 3.0.2?
(I want to improve the code, but I would be happy with a workaround or if 
confirmed that is Phoenix bug).

The problematic code is in file src/robotide/editor/kweditor.py. 
-----

Attached is an example file. And image of it opened in RIDE.

Please help this Software Tester (also Software Archeologist :) ), I will 
help testing your open source projects if you want :). 

Thank you,
Help

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