The canonical way to disable all auto-insertion hooks is
set-option global disabled_hooks .*-insert
A recent change allowed to disable hooks that insert ) and }
independent of hooks that insert // (a step in the right
direction, we should do it for more filetypes).
Since the new hook ("go-insert-closing-delimiter") doesn't match
.*-insert, it broke the above snippet. Fix this by renaming it to
"go-closing-delimiter-insert".
This makes it a bit less obvious how to disable only comment insertion.
Not sure if there's interest in that, but make it easier by renaming
"go-insert" to "go-comment-insert".
When indenting on newline in Go files, only remove trailing whitespace
on the previous line and copy indentation of the previous line if in
comment context.
Added regression tests.
