[escher] ExpressionView: discard optimization that triggers a bug

escher/src/expression_view.cpp

@@ -15,9 +15,13 @@ ExpressionView::ExpressionView(float horizontalAlignment, float verticalAlignmen
 }
 
 bool ExpressionView::setLayout(Layout layoutR) {
-  if (m_layout.isIdenticalTo(layoutR)) {
+  /* TODO: this would avoid some useless redrawing. However, when we call
+   * setLayout after raising an Exception that led to erase all
+   * Poincare::TreePool, accessing m_layout will result in an ACCESS ERROR.
+   * How do we avoid that? */
+  /*if (m_layout.isIdenticalTo(layoutR)) {
     return false;
-  }
+  }*/
   m_layout = layoutR;
   markRectAsDirty(bounds());
   return true;