Update tabs navigation to take offscreen tabs into account

modules/corelib/ui/uimovabletabbar.lua

@@ -389,10 +389,16 @@ function UIMoveableTabBar:selectNextTab()
     if #self.postTabs > 0 then
       local widget = showPostTab(self)
       self:selectTab(widget)
-      updateTabs(self)
     else
+      if #self.preTabs > 0 then
+        for i = 1, #self.preTabs do
+          showPreTab(self)
+        end
+      end
+
       self:selectTab(self.tabs[1])
     end
+    updateTabs(self)
     return
   end
 
@@ -419,10 +425,16 @@ function UIMoveableTabBar:selectPrevTab()
     if #self.preTabs > 0 then
       local widget = showPreTab(self)
       self:selectTab(widget)
-      updateTabs(self)
     else
+      if #self.postTabs > 0 then
+        for i = 1, #self.postTabs do
+          showPostTab(self)
+        end
+      end
+
       self:selectTab(self.tabs[#self.tabs])
     end
+    updateTabs(self)
     return
   end