Break if the first group has an end of line comment (#1681)

This was unstable

src/printer.js

@@ -3347,6 +3347,7 @@ function printMemberChain(path, options, print) {
   const printedGroups = groups.map(printGroup);
   const oneLine = concat(printedGroups);
   const hasComment =
+    groups[0][groups[0].length - 1].node.comments ||
     (groups.length >= 2 && groups[1][0].node.comments) ||
     (groups.length >= 3 && groups[2][0].node.comments);
 

tests/method-chain/__snapshots__/jsfmt.spec.js.snap

@@ -230,6 +230,17 @@ Something
   // $FlowFixMe(>=0.41.0)
   .getInstance(this.props.dao)
   .getters()
+
+// Warm-up first
+measure()
+  .then(() => {
+    SomethingLong();
+  });
+
+measure() // Warm-up first
+  .then(() => {
+    SomethingLong();
+  });
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 function f() {
   return (
@@ -257,6 +268,16 @@ Something
   .getInstance(this.props.dao)
   .getters();
 
+// Warm-up first
+measure().then(() => {
+  SomethingLong();
+});
+
+measure() // Warm-up first
+  .then(() => {
+    SomethingLong();
+  });
+
 `;
 
 exports[`first_long.js 1`] = `

tests/method-chain/comment.js

@@ -22,3 +22,14 @@ Something
   // $FlowFixMe(>=0.41.0)
   .getInstance(this.props.dao)
   .getters()
+
+// Warm-up first
+measure()
+  .then(() => {
+    SomethingLong();
+  });
+
+measure() // Warm-up first
+  .then(() => {
+    SomethingLong();
+  });