When having a treetableview with a a few columns,
the double clict default action behaviour is strange.
the default actiop is trigger only when double
clicking on the text or the icon in the tree part
of the view. however because of the grid, the
field has clearly defined borders, but it's
clicking within the field has no effect, it has to
be clicked on the text itself. I believe that is
wrong, because the grid gives thet impression of a
table cell, which has unified behaviour across the
cell, no matter if there's text or not.
It would be fixed together with issue 30932 in latest in 4.0.
the default action is now always fired regardless which part of the
tree column is doubleclicked.