Restore only the collapsed leading space when copy text

third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp

Index: third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp
diff --git a/third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp b/third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp
index 5066087f2511b6ab5efd9ae5a543b93a0047209c..f95f9dfbd7e555b3811d676beec91e7aa7ddf8a8 100644
--- a/third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp
+++ b/third_party/WebKit/Source/core/editing/iterators/TextIterator.cpp
@@ -615,8 +615,13 @@ void TextIteratorAlgorithm<Strategy>::handleTextBox()
                         // See http://crbug.com/318925
                         // For trailing space.
                         if (!nextTextBox && m_textBox->root().nextRootBox() && m_textBox->root().lastChild() == m_textBox) {
-                            if (str.endsWith(' ') && subrunEnd == str.length() - 1 && str[subrunEnd - 1] != ' ')
-                                ++subrunEnd;
+                            if (str.endsWith(' ') && subrunEnd == str.length() - 1 && str[subrunEnd - 1] != ' ') {
+                                // If there is the leading space in the next line, we don't need to restore the trailing space.
+                                // Example: <div style="width: 2em;"><b><i>foo </i></b> bar</div>
+                                String textOfNextline = m_textBox->root().nextRootBox()->firstChild()->getLineLayoutItem().node()->nodeValue();
+                                if (textOfNextline[0] != ' ')
+                                    ++subrunEnd;
+                            }
                         }
                         // For leading space.
                         if (!emitsImageAltText() && !doesNotBreakAtReplacedElement() && !forInnerText()