Make Editor::appliedEditing update layout before changing selection

third_party/WebKit/LayoutTests/editing/pasteboard/copy-paste-underlined.html

Index: third_party/WebKit/LayoutTests/editing/pasteboard/copy-paste-underlined.html
diff --git a/third_party/WebKit/LayoutTests/editing/pasteboard/copy-paste-underlined.html b/third_party/WebKit/LayoutTests/editing/pasteboard/copy-paste-underlined.html
index 38aea5bc3e79c5c248b4be650e70add607ef9abb..704b7aff52926d3f9f8b4987ec0aba1361423650 100644
--- a/third_party/WebKit/LayoutTests/editing/pasteboard/copy-paste-underlined.html
+++ b/third_party/WebKit/LayoutTests/editing/pasteboard/copy-paste-underlined.html
@@ -25,4 +25,27 @@ test(() => {
         '<div contenteditable id="paste"><u>foo bar baz.|</u></div>'
       ].join(''));
   }, 'Copy/paste underlined text.');
+
+test(() => {
+  assert_not_equals(
+      window.testRunner, undefined,
+     'This test requires testRunner.');
+
+  assert_selection(
+      [
+        '<div contenteditable spellcheck="false">^foo bar baz.|</div>',
+        '<div contenteditable id="paste"><br></div>'
+      ].join(''),
+      selection => {
+        const document = selection.document;
+        document.execCommand('underline');
+        document.execCommand('copy');
+        document.getElementById('paste').focus();
+        document.execCommand('paste');
+      },
+      [
+        '<div contenteditable spellcheck="false"><u>foo bar baz.</u></div>',
+        '<div contenteditable id="paste"><u>foo bar baz.|</u></div>'
+      ].join(''));
+  }, 'Copy/paste underlined text with spell checker off.');
 </script>