Add filter to layout state

src/core/plugins/layout/actions.js

@@ -1,6 +1,7 @@
 import { normalizeArray } from "core/utils"
 
 export const UPDATE_LAYOUT = "layout_update_layout"
+export const UPDATE_FILTER = "layout_update_filter"
 export const UPDATE_MODE = "layout_update_mode"
 export const SHOW = "layout_show"
 
@@ -13,6 +14,13 @@ export function updateLayout(layout) {
   }
 }
 
+export function updateFilter(filter) {
+  return {
+    type: UPDATE_FILTER,
+    payload: filter
+  }
+}
+
 export function show(thing, shown=true) {
   thing = normalizeArray(thing)
   return {