Don't determine row height before the contents are rendered (#8313)

src/com/vaadin/terminal/gwt/client/ui/VScrollTable.java

@@ -1608,6 +1608,9 @@ public class VScrollTable extends FlowPanel implements HasWidgets,
             return;
         }
         sizeNeedsInit = false;
+
+        scrollBody.setContainerHeight();
+
         /*
          * We will use browsers table rendering algorithm to find proper column
          * widths. If content and header take less space than available, we will
@@ -4146,12 +4149,6 @@ public class VScrollTable extends FlowPanel implements HasWidgets,
             throw new UnsupportedOperationException();
         }
 
-        @Override
-        protected void onAttach() {
-            super.onAttach();
-            setContainerHeight();
-        }
-
         /**
          * Fix container blocks height according to totalRows to avoid
          * "bouncing" when scrolling