(defun sh-smie--default-backward-token ()
[...]
(progn (skip-syntax-backward ".w_'")
(or (not (zerop (skip-syntax-backward "\\")))
(when (eq ?\\ (char-before (1- (point))))
Semi-colons have punctuation syntax, so we're skipping back over the
entirety of "test;then" instead of stopping after "then".
We should indeed only skip over "then", and then only over ";" and then
only over "test".
This looks easy enough to fix, but the overall logic of that function is
somewhat obscure to me, so I've added Stefan to the comments; perhaps he
has some comments.
The sh syntax is fairly nasty to parse, especially backwards, so I can't
give you any general comment here. I'd try something and then see if it
breaks any tests (including looking at test/manual/indent/shell.sh).
For sure, I'd recommend adding a regression test.
just a further point, if it helps, this was fine in 27.2.