When I double-click select "test_NameHere" the whole
thing is selects, but if I double-click select
"test_NameHere_4", on "test_NameHere" is selected.
Double-click selection ought to be consistent, even
when numbers are involved.
I propose that double-click select everything up to the
first _, triple-clicking should select everything
concatenated by _s, and quadruple-clicking should
select the whole line.