Preserve inline comment as last argument (#1390)

We already had the logic but only applied it for comments on their own line, we should also do it if they are inline.

Fixes #1380

src/comments.js

@@ -192,6 +192,13 @@ function attach(comments, ast, text) {
       }
     } else if (util.hasNewline(text, locEnd(comment))) {
       if (
+        handleLastFunctionArgComments(
+          text,
+          precedingNode,
+          enclosingNode,
+          followingNode,
+          comment
+        ) ||
         handleConditionalExpressionComments(
           enclosingNode,
           precedingNode,

tests/comments/__snapshots__/jsfmt.spec.js.snap

@@ -714,6 +714,47 @@ class X {
   ): $Enum<SectionMode> {
   }
 }
+
+class Foo {
+  a(lol /*string*/) {}
+
+  b(lol /*string*/
+  ) {}
+
+  d(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) {}
+
+  d(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) /*string*/ {}
+
+  // prettier-ignore
+  c(lol /*string*/
+  ) {}
+
+  // prettier-ignore
+  d(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) {}
+
+  // prettier-ignore
+  e(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) {} /* string*/
+}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 type f = (
   currentRequest: { a: number }
@@ -767,6 +808,42 @@ class X {
   ): $Enum<SectionMode> {}
 }
 
+class Foo {
+  a(lol /*string*/) {}
+
+  b(lol /*string*/) {}
+
+  d(lol /*string*/, lol2 /*string*/, lol3 /*string*/, lol4 /*string*/) {}
+
+  d(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) /*string*/ {
+  }
+
+  // prettier-ignore
+  c(lol /*string*/
+  ) {}
+
+  // prettier-ignore
+  d(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) {}
+
+  // prettier-ignore
+  e(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) {} /* string*/
+}
+
 `;
 
 exports[`preserve-new-line-last.js 1`] = `

tests/comments/last-arg.js

@@ -51,3 +51,44 @@ class X {
   ): $Enum<SectionMode> {
   }
 }
+
+class Foo {
+  a(lol /*string*/) {}
+
+  b(lol /*string*/
+  ) {}
+
+  d(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) {}
+
+  d(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) /*string*/ {}
+
+  // prettier-ignore
+  c(lol /*string*/
+  ) {}
+
+  // prettier-ignore
+  d(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) {}
+
+  // prettier-ignore
+  e(
+    lol /*string*/,
+    lol2 /*string*/,
+    lol3 /*string*/,
+    lol4 /*string*/
+  ) {} /* string*/
+}