They didn't just allow for the style patterns they were added to,
but allowed for some messed up indentation to slip through. Now
that we adapted the code to not use the old style, it's time to
drop the exceptions.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/725
Regarding coding style, gjs is moving in a direction that departs quite
significantly from the established style, in particular when indenting
multi-line array/object literals or method arguments:
Currently we are keeping those elements aligned, while the gjs rules now
expect them to use the regular 4-space indentation.
There are certainly good arguments that can be made for that move - it's
much less prone to leading to overly-long lines, and matches popluar JS
styles elsewhere. But switching coding style implies large diffs which
interfere with git-blame and friends, so in order to allow for a more
gradual change, add a separate set of "legacy" rules that match more
closely the style we would expect up to now.
It also disables the rules for quotes and template strings - the former
because we cannot match the current style to use double-quotes for
translatable strings and single-quotes otherwise, the latter because
template strings are still relatively new, so we haven't adopted them
yet.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/609
