Restore a collapsed trailing space of text used for line break

third_party/WebKit/LayoutTests/editing/pasteboard/preserve-trailing-space.html

Index: third_party/WebKit/LayoutTests/editing/pasteboard/preserve-trailing-space.html
diff --git a/third_party/WebKit/LayoutTests/editing/pasteboard/preserve-trailing-space.html b/third_party/WebKit/LayoutTests/editing/pasteboard/preserve-trailing-space.html
index a535a0b7227807e0d0406a48abc6df0bd6e16e5e..28a4a96e9f23c1f4ad36bbe64ac85a47ed9e8bfd 100644
--- a/third_party/WebKit/LayoutTests/editing/pasteboard/preserve-trailing-space.html
+++ b/third_party/WebKit/LayoutTests/editing/pasteboard/preserve-trailing-space.html
@@ -13,5 +13,44 @@ test(() => assert_selection(
     selection.document.execCommand('paste');
   },
   '<div id="copy" style="width: 10em;">Copy this area <a href="http://foo/">AVeryLongWordThatWillWrap</a></div><div contenteditable id="editor">Copy this area\u00A0<a href="http://foo/">AVeryLongWordThatWillWrap|</a></div>'),
-  'Restore the collapsed space');
+  '1. Restore the collapsed space');
+
+test(() => assert_selection(
+  '<div style="width: 2em;"><b><i>^foo </i></b>bar|</div><div contenteditable id="editor"></div>',
+  selection => {
+    var copy = selection.document.getElementById('copy');

[yosin_UTC9, 2016/09/02 04:14:10]

Could you utilize |selection.setClipboardData()|?
See http://crrev.com/2303533003

[joone, 2016/09/02 07:32:50]

It doesn't work with this function because we only need to copy the tags under
<div style="width: 2em;">.

[yosin_UTC9, 2016/09/05 01:42:22]

assert_selection(
  '<div style="width: 2em;"><b><i>foo </i></b>bar</div><div>|</div>',
  selection => {
     selection.setClipboardData('<b><i>foo</i></b>bar');
     selection.document.execCommand('paste');
  },
  ...);

Should work

+    var editor = selection.document.getElementById('editor');
+
+    selection.document.execCommand('copy');
+    selection.collapse(editor);
+    selection.document.execCommand('paste');
+  },
+ '<div style="width: 2em;"><b><i>foo </i></b>bar</div><div contenteditable id="editor"><b><i>foo\u00A0</i></b>bar|</div>'),
+  '2. Restore the collapsed space');
+
+test(() => assert_selection(
+  '<div style="width: 2em;">^작은홍띠점박이푸른부전나비|</div><div contenteditable id="editor"></div>',
+  selection => {
+    var copy = selection.document.getElementById('copy');
+    var editor = selection.document.getElementById('editor');
+
+    selection.document.execCommand('copy');
+    selection.collapse(editor);
+    selection.document.execCommand('paste');
+  },
+ '<div style="width: 2em;">작은홍띠점박이푸른부전나비</div><div contenteditable id="editor">작은홍띠점박이푸른부전나비|</div>'),
+  '3. Space should not be added for CJK');
+
+test(() => assert_selection(
+  '<div style="width: 2em; word-break: break-all">^Pneumonoultramicroscopicsilicovolcanoconiosis|</div><div contenteditable id="editor"></div>',
+  selection => {
+    var copy = selection.document.getElementById('copy');
+    var editor = selection.document.getElementById('editor');
+
+    selection.document.execCommand('copy');
+    selection.collapse(editor);
+    selection.document.execCommand('paste');
+  },
+ '<div style="width: 2em; word-break: break-all">Pneumonoultramicroscopicsilicovolcanoconiosis</div><div contenteditable id="editor">Pneumonoultramicroscopicsilicovolcanoconiosis|</div>'),
+  '4. Space should not be added for CSS word-break: break-all');
 </script>