Prevent spamming home refresh

components/home/Home.xml

@@ -6,6 +6,7 @@
   </children>
   <interface>
     <field id="selectedItem" alias="homeRows.selectedItem" />
+    <field id="timeLastRefresh" type="integer" />
     <function name="refresh" />
   </interface>
   <script type="text/brightscript" uri="Home.brs" />

source/Main.brs

@@ -435,8 +435,11 @@ sub RemoveCurrentGroup()
     group.setFocus(true)
   end if
   if group.subtype() = "Home" then
-    ' refresh home page
-    group.callFunc("refresh")
+    currentTime = CreateObject("roDateTime").AsSeconds()
+    if group.timeLastRefresh = invalid  or (currentTime - group.timeLastRefresh) > 20 then
+      group.timeLastRefresh = currentTime
+      group.callFunc("refresh")
+    end if
   end if
   group.visible = true
 end sub