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Prior to the proppanel rewrite, TTV would show selection, but not focus (or the active row). This was bad. Now it shows the active row when the component is focussed, which is good. Unfortunately it looks horrible on Metal L&F at least, not at all like TreeView: the focus border is black (should be dark blue), and is drawn too narrowly, actually inside the selection block, nearly clipping the text of the node label. See screenshots. Ideally the TTV selection would look very much like the TV selection.
Created attachment 12485 [details] Focussed TreeView with a node selection - OK
Created attachment 12486 [details] Focussed TreeTableView with a node selection - yick!
I agree it's not gorgeous, just consistent with what TTV already did for columns *other* than the tree column (and since keyboard navigation now works, you're noticing that it's ugly). I did make the square 1 pixel bigger than it was before (but the tree cell height may be smaller, depending on your font). It *might* be possible to draw the tree grid square as the focus rectangle - that would be ideal. It didn't work out too well when I tried it on the property sheet table for disabled properties - the problem is convincing the table that it needs to *repaint* the grid lines - otherwise as focus moves from cell to cell, it leaves droppings.
*** Issue 37977 has been marked as a duplicate of this issue. ***
Fixed in trunk.
verified in NB3.6 (RC1 200403151830)