Update debounce to random timeout

app/coffee/modules/kanban/main.coffee

@@ -345,7 +345,8 @@ class KanbanController extends mixOf(taiga.Controller, taiga.PageMixin, taiga.Fi
 
     initializeSubscription: ->
         routingKey1 = "changes.project.#{@scope.projectId}.userstories"
-        @events.subscribe @scope, routingKey1, debounceLeading(500, (message) =>
+        randomTimeout = taiga.randomInt(700, 1000)
+        @events.subscribe @scope, routingKey1, debounceLeading(randomTimeout, (message) =>
             @.loadUserstories())
 
     loadInitialData: ->

app/coffee/utils.coffee

@@ -266,6 +266,10 @@ getMatches = (string, regex, index) ->
 
     return matches
 
+randomInt = (start, end) ->
+    interval = end - start
+    return start + Math.floor(Math.random()*(interval+1))
+
 taiga = @.taiga
 taiga.addClass = addClass
 taiga.nl2br = nl2br
@@ -297,3 +301,4 @@ taiga.patch = patch
 taiga.getRandomDefaultColor = getRandomDefaultColor
 taiga.getDefaulColorList = getDefaulColorList
 taiga.getMatches = getMatches
+taiga.randomInt = randomInt