The unnecessary tset lint was assuming a single key, but it was
triggering for calls with multiple nested keys, causing the quickfix
action to drop all elements after the fourth argument, which was assumed
to be the value.
Now it's been updated to handle nested calls of any depth.
These strings will be displayed in a menu for the user to select.
The error codes, in addition to not being human readable sentences,
describe the issue being reported, not the solution that will be
applied.
The code action response only includes the human readable string, so the
tests need to check for that. I considered adding a custom field but
decided against going out of spec.
