Please describe the problem:
When some row of GtkTreeView is in edit mode and when the cursor is in
GtkComboBox the selected data of this cell can not be retrieved. I try the same
situation with another types of components like Edit, Text, CheckBox, etc. where
everything is working. The problem is occured only when the cursor is at
ComboBox in edit mode.
The problem can be inderectly solved when I move the selected cell to another
cell of the same row with mouse or keyboard.

Steps to reproduce:
1. Create one TreeView with 3 columns. One of the columns to be ComboBox. The
another columns can be what you want.
2. Create new row and choose some value from the column with ComboBox.
3. Go to another compenent outside the TreeView to loss the focus
4. Retrieve the data from the current row of TreeView. You will see that all
cells are with actual data exept the cell where is located ComboBox.


Actual results:
The data from cell where is ComboBox is lost.

Expected results:
To retrieve the selected data from ComboBox

Does this happen every time?
Yes

Other information: