Add parens for ConditionalExpression inside JSXSpreadAttribute (#1015)

src/fast-path.js

@@ -440,6 +440,7 @@ FPp.needsParens = function(assumeExpressionContext) {
         case "LogicalExpression":
         case "ExportDefaultDeclaration":
         case "AwaitExpression":
+        case "JSXSpreadAttribute":
           return true;
 
         case "NewExpression":

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

@@ -551,6 +551,8 @@ exports[`parens.js 1`] = `
     d='M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,'
   />,        
 ];
+
+<div {...((foo || foo === null) ? {foo} : null)} />
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 a = [
   <path
@@ -562,6 +564,8 @@ a = [
     d=\\"M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,\\"
   />
 ];
+
+<div {...foo || foo === null ? { foo } : null} />;
 "
 `;
 
@@ -576,6 +580,8 @@ exports[`parens.js 2`] = `
     d='M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,'
   />,        
 ];
+
+<div {...((foo || foo === null) ? {foo} : null)} />
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 a = [
   <path
@@ -587,6 +593,8 @@ a = [
     d=\\"M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,\\"
   />
 ];
+
+<div {...foo || foo === null ? { foo } : null} />;
 "
 `;
 

tests/jsx/parens.js

@@ -8,3 +8,5 @@ a = [
     d='M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,M13.6,10.6l,4-2.8L9.5,'
   />,        
 ];
+
+<div {...((foo || foo === null) ? {foo} : null)} />