[vcs-log] fix newlines in getSelectedText in details panel IDEA-131488

platform/vcs-log/impl/src/com/intellij/vcs/log/ui/frame/DetailsPanel.java

@@ -50,8 +50,17 @@ import javax.swing.border.CompoundBorder;
 import javax.swing.border.MatteBorder;
 import javax.swing.event.ListSelectionEvent;
 import javax.swing.event.ListSelectionListener;
+import javax.swing.text.BadLocationException;
 import javax.swing.text.DefaultCaret;
+import javax.swing.text.Document;
+import javax.swing.text.Position;
+import javax.swing.text.html.HTMLEditorKit;
+import javax.swing.text.html.parser.ParserDelegator;
 import java.awt.*;
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+import java.io.StringWriter;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -315,6 +324,47 @@ class DetailsPanel extends JPanel implements ListSelectionListener {
       return authorText;
     }
 
+    @Override
+    public String getSelectedText() {
+      Document doc = getDocument();
+      int start = getSelectionStart();
+      int end = getSelectionEnd();
+
+      try {
+        Position p0 = doc.createPosition(start);
+        Position p1 = doc.createPosition(end);
+        StringWriter sw = new StringWriter(p1.getOffset() - p0.getOffset());
+        getEditorKit().write(sw, doc, p0.getOffset(), p1.getOffset() - p0.getOffset());
+
+        MyHtml2Text parser = new MyHtml2Text();
+        parser.parse(new StringReader(sw.toString()));
+        return parser.getText();
+      }
+      catch (BadLocationException e) {
+      }
+      catch (IOException e) {
+      }
+      return super.getSelectedText();
+    }
+
+    private static class MyHtml2Text extends HTMLEditorKit.ParserCallback {
+      @NotNull private StringBuffer myBuffer;
+
+      public void parse(Reader in) throws IOException {
+        myBuffer = new StringBuffer();
+        new ParserDelegator().parse(in, this, Boolean.TRUE);
+      }
+
+      public void handleText(char[] text, int pos) {
+        myBuffer.append(text);
+        myBuffer.append("\n");
+      }
+
+      public String getText() {
+        return myBuffer.toString();
+      }
+    }
+
     @Override
     public Color getBackground() {
       return getDetailsBackground();