Fix a case where significant whitespace was dropped (#2270)

src/printer.js

@@ -3877,6 +3877,10 @@ function printJSXElement(path, options, print) {
       children[i] === softline &&
       children[i + 1] === "" &&
       children[i + 2] === jsxWhitespace;
+    const isJSXWhitespaceFollowedBySoftline =
+      children[i] === jsxWhitespace &&
+      children[i + 1] === "" &&
+      children[i + 2] === softline;
     const isEmptyFollowedByHardline =
       children[i] === "" && children[i + 1] === hardline;
     if (
@@ -3885,6 +3889,8 @@ function printJSXElement(path, options, print) {
       (isEmptyFollowedByHardline && containsText)
     ) {
       children.splice(i, 2);
+    } else if (isJSXWhitespaceFollowedBySoftline) {
+      children.splice(i + 1, 2);
     }
   }
 

tests/jsx-text-wrap/__snapshots__/jsfmt.spec.js.snap

@@ -263,6 +263,14 @@ jsx_whitespace_after_tag =
     {" "}
     ({variable})
   </div>
+
+x =
+  <div>
+    ENDS IN <div>
+      text text text text text text text text text text text
+    </div>{" "}
+    HRS
+  </div>
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // Wrapping text
 x = (
@@ -598,4 +606,13 @@ jsx_whitespace_after_tag = (
   </div>
 );
 
+x = (
+  <div>
+    ENDS IN <div>
+      text text text text text text text text text text text
+    </div>{" "}
+    HRS
+  </div>
+);
+
 `;

tests/jsx-text-wrap/test.js

@@ -260,3 +260,11 @@ jsx_whitespace_after_tag =
     {" "}
     ({variable})
   </div>
+
+x =
+  <div>
+    ENDS IN <div>
+      text text text text text text text text text text text
+    </div>{" "}
+    HRS
+  </div>