Fix break on conditional expressions inside return

Fixes #2777

Since we can't break after `return` and don't add `()` around
ConditionalExpressions' tests, we end up with some weird indentation when
breaking.

src/printer.js

@@ -346,7 +346,8 @@ function genericPrintNoParens(path, options, print, args) {
           parentParent.type === "JSXAttribute") ||
         (n === parent.body && parent.type === "ArrowFunctionExpression") ||
         (n !== parent.body && parent.type === "ForStatement") ||
-        parent.type === "ConditionalExpression";
+        (parent.type === "ConditionalExpression" &&
+          parentParent.type !== "ReturnStatement");
 
       const shouldIdentIfInlining =
         parent.type === "AssignmentExpression" ||

tests/binary-expressions/__snapshots__/jsfmt.spec.js.snap

@@ -352,6 +352,46 @@ x & (y >> z);
 
 `;
 
+exports[`return.js 1`] = `
+function foo() {
+  return this.hasPlugin("dynamicImports") && this.lookahead().type === tt.parenLeft.right;
+}
+
+function foo() {
+  return this.hasPlugin("dynamicImports") && this.lookahead().type === tt.parenLeft.right
+    ? true
+    : false;
+}
+
+function foo() {
+  return this.calculate().compute().first.numberOfThings > this.calculate().compute().last.numberOfThings
+    ? true
+    : false;
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+function foo() {
+  return (
+    this.hasPlugin("dynamicImports") &&
+    this.lookahead().type === tt.parenLeft.right
+  );
+}
+
+function foo() {
+  return this.hasPlugin("dynamicImports") &&
+    this.lookahead().type === tt.parenLeft.right
+    ? true
+    : false;
+}
+
+function foo() {
+  return this.calculate().compute().first.numberOfThings >
+    this.calculate().compute().last.numberOfThings
+    ? true
+    : false;
+}
+
+`;
+
 exports[`short-right.js 1`] = `
 this._cumulativeHeights &&
  Math.abs(

tests/binary-expressions/return.js

@@ -0,0 +1,15 @@
+function foo() {
+  return this.hasPlugin("dynamicImports") && this.lookahead().type === tt.parenLeft.right;
+}
+
+function foo() {
+  return this.hasPlugin("dynamicImports") && this.lookahead().type === tt.parenLeft.right
+    ? true
+    : false;
+}
+
+function foo() {
+  return this.calculate().compute().first.numberOfThings > this.calculate().compute().last.numberOfThings
+    ? true
+    : false;
+}