Fix #33939

- Add protected and private visibility keywords to increaseIndentPattern
- Remove `when` keyword from decreaseIndentPattern

extensions/ruby/language-configuration.json

@@ -23,7 +23,7 @@
 		["'", "'"]
 	],
 	"indentationRules": {
-		"increaseIndentPattern": "^\\s*((begin|class|def|else|elsif|ensure|for|if|module|rescue|unless|until|when|while)|(.*\\sdo\\b))\\b[^\\{;]*$",
-		"decreaseIndentPattern": "^\\s*([}\\]]([,)]?\\s*(#|$)|\\.[a-zA-Z_]\\w*\\b)|(end|rescue|ensure|else|elsif|when)\\b)"
+		"increaseIndentPattern": "^\\s*((begin|class|(private|protected)\\s+def|def|else|elsif|ensure|for|if|module|rescue|unless|until|when|while)|(.*\\sdo\\b))\\b[^\\{;]*$",
+		"decreaseIndentPattern": "^\\s*([}\\]]([,)]?\\s*(#|$)|\\.[a-zA-Z_]\\w*\\b)|(end|rescue|ensure|else|elsif)\\b)"
 	}
-}
\ No newline at end of file
+}