use transparent scroll bars in editor by default

platform/platform-impl/src/com/intellij/openapi/editor/impl/EditorMarkupModelImpl.java

@@ -479,7 +479,7 @@ public class EditorMarkupModelImpl extends MarkupModelImpl implements EditorMark
   }
   
   private boolean transparent() {
-    return !myEditor.shouldScrollBarBeOpaque() && EditorUtil.isRealFileEditor(myEditor);
+    return !myEditor.shouldScrollBarBeOpaque();
   }
 
   private class MyErrorPanel extends ButtonlessScrollBarUI implements MouseMotionListener, MouseListener, MouseWheelListener, UISettingsListener {

platform/util/resources/misc/registry.properties

@@ -759,7 +759,7 @@ editor.caret.width=2
 editor.caret.width.description=Caret width
 editor.caret.width.restartRequired=true
 
-editor.transparent.scrollbar=false
+editor.transparent.scrollbar=true
 editor.transparent.scrollbar.description=Don't paint background for editor scroll bars
 
 editor.full.width.scrollbar=false