[escher] The layout should not change if ELField cannot handle event.

Change-Id: Ie3a59400a054680aa8cc42ab755708aa2fa19e2d

escher/src/expression_layout_field.cpp

@@ -59,6 +59,7 @@ bool ExpressionLayoutField::handleEvent(Ion::Events::Event event) {
     }
     return true;
   }
+  m_contentView.cursor()->hideEmptyLayoutIfNeeded();
   return false;
 }