Group [0] at the end of the previous chain instead of beginning of next one (#784)

Fixes #775

src/printer.js

@@ -2287,6 +2287,13 @@ function printMemberChain(path, options, print) {
     if (
       hasSeenCallExpression && printedNodes[i].node.type === "MemberExpression"
     ) {
+      // [0] should be appended at the end of the group instead of the
+      // beginning of the next one
+      if (printedNodes[i].node.computed) {
+        currentGroup.push(printedNodes[i]);
+        continue;
+      }
+
       groups.push(currentGroup);
       currentGroup = [];
       hasSeenCallExpression = false;

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

@@ -242,6 +242,21 @@ if (testConfig.ENABLE_ONLINE_TESTS === \\"true\\") {
 "
 `;
 
+exports[`square_0.js 1`] = `
+"const version = someLongString
+  .split('jest version =')
+  .pop()
+  .split(EOL)[0]
+  .trim();
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+const version = someLongString
+  .split(\\"jest version =\\")
+  .pop()
+  .split(EOL)[0]
+  .trim();
+"
+`;
+
 exports[`test.js 1`] = `
 "method().then(x => x)
   [\\"abc\\"](x => x)

tests/method-chain/square_0.js

@@ -0,0 +1,5 @@
+const version = someLongString
+  .split('jest version =')
+  .pop()
+  .split(EOL)[0]
+  .trim();