In Shell-script mode, indentation after a line continuation seems broken:
aaaaaaaaaaaaaaaaaaaa \
indents to the correct 4 spaces, but
aaaaaaaaaa aaaaaaaaa \
indents to the first whitespace in the line
${aaaaaaaaaaa}aaaaa \
indents to after the closing bracket
( aaaaaaaaa ) && aa \
indents to after the line continuation
This seems to be very underisable, and there should at least be an option
of getting back the old behaviour of a fixed indent.
There is: Set `sh-indent-after-continuation' to 'always.