Undo selection appends genes from differential expression to user gene list (#1183)

* Undo selection appends diffExp genes to user gene list

Fixes https://github.com/chanzuckerberg/cellxgene/issues/1171

Need: When a user performs a differential expression from within
a sub-selection (world) of the data and then resets the selection to all
cells (universe), the differential expression results are no longer
valid.

Approach:
* When the selection is reset, move the top (maxUserDefinedGenes
- len(userDefinedGenes) from the differential expression results to the
list of user defined genes
* Raise maxUserDefinedGenes to 25 to give users more room and
accommodate the extra genes transferred in from differential expression

Other commits:
* Choose different button icons
* Add diff exp genes to user defined genes on subset too
* Respond to feedback from @liaprins-czi and @bkmartinjr

client/src/reducers/controls.js

@@ -1,6 +1,8 @@
 // jshint esversion: 6
 
 import _ from "lodash";
+import * as globals from "../globals";
+import { subsetAndResetGeneLists } from "../util/stateManager/controlsHelpers";
 
 const Controls = (
   state = {
@@ -74,16 +76,22 @@ const Controls = (
       };
     }
     case "reset World to eq Universe": {
+      const [ newUserDefinedGenes, newDiffExpGenes ] = subsetAndResetGeneLists(state);
       return {
         ...state,
-        resettingInterface: false
+        resettingInterface: false,
+        userDefinedGenes: newUserDefinedGenes,
+        diffexpGenes: newDiffExpGenes
       };
     }
     case "set World to current selection": {
+      const [ newUserDefinedGenes, newDiffExpGenes ] = subsetAndResetGeneLists(state);
       return {
         ...state,
         loading: false,
-        error: null
+        error: null,
+        userDefinedGenes: newUserDefinedGenes,
+        diffexpGenes: newDiffExpGenes
       };
     }
     case "request user defined gene started": {