gtk_tree_view_column_cell_get_position() method is signaling into the
redererGetPreferredWidthCallback every time it is run, causing a
recursive loop when MeasuredEvent has a listener in GTK3. I've disabled
and re-enabled the callback when calling
gtk_tree_view_column_cell_get_position() in a private method
gtk_tree_view_column_get_position() to fix this issue.

Tested on GTK3.14 -> GTK3.21+ and GTK2.

Change-Id: I0abd12c968a777c05c0456bd98c2c9c778e11f81
Signed-off-by: Ian Pun <ipun@redhat.com>