Merge branch 'filter-bug-fix' into 'master'

Fix bug with JS error from dropdowns in filter area

Fixes:

![consoleerror](/uploads/0fa19a943050baac855c9e6f896ea941/consoleerror.png)

This error is not a logged issue yet.

Error when turbolinks fetches a new page, `setup()` was not run. 

Signed-off-by: Jacob Schatz <jschatz@gitlab.com>

cc @iamphill @alfredo1 

See merge request !3216

app/assets/javascripts/breakpoints.coffee

@@ -10,7 +10,6 @@ class @Breakpoints
     setup: ->
       allDeviceSelector = BREAKPOINTS.map (breakpoint) ->
         ".device-#{breakpoint}"
-
       return if $(allDeviceSelector.join(",")).length
       # Create all the elements
@@ -18,12 +17,17 @@ class @Breakpoints
         "<div class='device-#{breakpoint} visible-#{breakpoint}'></div>"
       $("body").append els.join('')
-    getBreakpointSize: ->
+    visibleDevice: ->
       allDeviceSelector = BREAKPOINTS.map (breakpoint) ->
         ".device-#{breakpoint}"
-      $visibleDevice = $(allDeviceSelector.join(",")).filter(":visible")
-
+      $(allDeviceSelector.join(",")).filter(":visible")
+    getBreakpointSize: ->
+      $visibleDevice = @visibleDevice
+      # the page refreshed via turbolinks
+      if not $visibleDevice().length
+        @setup()
+      $visibleDevice = @visibleDevice()
       return $visibleDevice.attr("class").split("visible-")[1]
   @get: ->