fix caret height on last line

AppKit/CPTextView/CPTextView.j

@@ -1712,12 +1712,12 @@ var kDelegateRespondsTo_textShouldBeginEditing
     else
     {
         caretRect = [_layoutManager boundingRectForGlyphRange:CPMakeRange(_selectionRange.location, 1) inTextContainer:_textContainer];
-        caretRect.size.height -= 3; // mimic the native caret metrics on macosx
     }
 
     caretRect.origin.x += _textContainerOrigin.x;
     caretRect.origin.y += _textContainerOrigin.y;
     caretRect.size.width = 1;
+    caretRect.size.height -= 3; // mimic the native caret metrics on macosx
     [_caret setRect:caretRect];
 
     if (flag)