Fix grid client side performance regression (#9913)

Trigger update of header/footer only if visibility changes.

Fixes #9884

diff --git a/client/src/main/java/com/vaadin/client/widgets/Grid.java b/client/src/main/java/com/vaadin/client/widgets/Grid.java
index 6799e46e20954802ac9b8771b26aba51a7eacbfc..dd9353155e0adcd86bf94d097bdcc818dd2c0144 100755 (executable)
--- a/client/src/main/java/com/vaadin/client/widgets/Grid.java
+++ b/client/src/main/java/com/vaadin/client/widgets/Grid.java
@@ -700,8 +700,10 @@ public class Grid<T> extends ResizeComposite implements HasSelectionHandlers<T>,
          *            true to show this section, false to hide
          */
         public void setVisible(boolean visible) {
-            this.visible = visible;
-            requestSectionRefresh();
+            if (this.visible != visible) {
+                this.visible = visible;
+                requestSectionRefresh();
+            }
         }
 
         /**