Ordering bug in editable trees
Steps to reproduce:
1) Open a tab with an editable tree.
2) Start to modify any field.
3) Click on another column header.
4) The following application error occurs:
File "C:\msys32\home\ced\5.2\tryton/tryton/gui/window/view_form/view/list_gtk/editabletree.py", line 316, in on_editing_done
File "C:\msys32\home\ced\5.2\tryton/tryton/gui/window/view_form/view/list_gtk/editabletree.py", line 99, in on_quit_cell
ValueError: Unknown renderer