test: fix and add more newline cases

lib/test/cases/newline.md

@@ -57,19 +57,53 @@ Copy following line indentation if previous line is not sibling:
 ```out
 (foo [a b
       |]
-     bar)
+ bar)
 ```
 
 > 3. pressing enter and moving the cursor to another line should not alter the AST
 
 ```in
 (foo [a b
       ]
-     bar)
+ bar)
 ```
 
 ```out
 (foo [a b]
       
-     bar)
+ bar)
+```
+
+## Combining Implications
+
+Sibling alignment:
+
+```in
+(foo [a b
+|] bar
+  baz)
+```
+
+```out
+(foo [a b
+      |]
+  bar
+  baz)
+```
+
+Implied `cursorDx` value can preserve relative indentation:
+
+```in
+(foo [a b
+|] (bar
+             123)
+  baz)
+```
+
+```out
+(foo [a b
+      |]
+  (bar
+    123)
+  baz)
 ```