trace-view: Use cursor selection to grab row
trace-view: Use cursor selection to grab row

Update the row selection using the cursor. This automates the moving
of the scroll window to the selected row as well as keeps the
focus there if the user uses the arrow keys after doing something
that changes the selection.

Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd