Indent while test the same way as if test (#352)

Fixes #312

src/printer.js

@@ -848,7 +848,15 @@ function genericPrintNoParens(path, options, print) {
     case "WhileStatement":
       return concat([
         "while (",
-        path.call(print, "test"),
+        group(
+          concat([
+            indent(
+              options.tabWidth,
+              concat([ softline, path.call(print, "test") ])
+            ),
+            softline
+          ])
+        ),
         ")",
         adjustClause(path.call(print, "body"), options)
       ]);

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

@@ -43,6 +43,27 @@ function bar(x: boolean) {
 "
 `;
 
+exports[`test indent.js 1`] = `
+"if (someVeryLongStringA && someVeryLongStringB && someVeryLongStringC && someVeryLongStringD) {}
+while (someVeryLongStringA && someVeryLongStringB && someVeryLongStringC && someVeryLongStringD) {}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+if (
+  someVeryLongStringA &&
+    someVeryLongStringB &&
+    someVeryLongStringC &&
+    someVeryLongStringD
+) {
+}
+while (
+  someVeryLongStringA &&
+    someVeryLongStringB &&
+    someVeryLongStringC &&
+    someVeryLongStringD
+) {
+}
+"
+`;
+
 exports[`test test.js 1`] = `
 "class C {
     m() { return new C; }

tests/while/indent.js

@@ -0,0 +1,2 @@
+if (someVeryLongStringA && someVeryLongStringB && someVeryLongStringC && someVeryLongStringD) {}
+while (someVeryLongStringA && someVeryLongStringB && someVeryLongStringC && someVeryLongStringD) {}