Make joined_default_parameter rule correctable

[ornithocoder]

as discussed with @marcelofabri #1746.

[ornithocoder]

@marcelofabri is there any rule for creating regular expressions for correctable rules? Should I build a rule that accepts blank spaces everywhere - e.g. . join ( separator : "" ) - or go for something more basic like \.joined\(separator:\s*?\"\"\), leaving the blank spaces to be taken care by other rules?

[marcelofabri]

In this case, I wouldn't use regexes at all. You already have all needed information from SourceKit:

{
	"key.namelength": 9,
	"key.nameoffset": 12,
	"key.length": 13,
	"key.name": "separator",
	"key.bodyoffset": 23,
	"key.bodylength": 2,
	"key.kind": "source.lang.swift.expr.argument",
	"key.offset": 12
}

Replacing the range (location: key.offset, length: key.length) with an empty string should work.