1 files changed, 10 insertions, 0 deletions
diff --git a/src/client/util/SnappingManager.ts b/src/client/util/SnappingManager.ts
index fc07e8ab4..069f81d38 100644
--- a/src/client/util/SnappingManager.ts
+++ b/src/client/util/SnappingManager.ts
@@ -1,4 +1,5 @@
 import { observable, action, runInAction } from "mobx";
+import { computedFn } from "mobx-utils";
 
 export namespace SnappingManager {
 
@@ -14,6 +15,9 @@ export namespace SnappingManager {
             this.horizSnapLines = horizLines;
             this.vertSnapLines = vertLines;
         }
+
+        @observable cachedGroups: string[] = [];
+        @action setCachedGroups(groups: string[]) { this.cachedGroups = groups; }
     }
 
     const manager = new Manager();
@@ -25,5 +29,11 @@ export namespace SnappingManager {
 
     export function SetIsDragging(dragging: boolean) { runInAction(() => manager.IsDragging = dragging); }
     export function GetIsDragging() { return manager.IsDragging; }
+
+    /// bcz; argh!! TODO;   These do not belong here, but there were include order problems with leaving them in util.ts
+    // need to investigate further what caused the mobx update problems and move to a better location.
+    const getCachedGroupByNameCache = computedFn(function (name: string) { return manager.cachedGroups.includes(name); }, true);
+    export function GetCachedGroupByName(name: string) { return getCachedGroupByNameCache(name); }
+    export function SetCachedGroups(groups: string[]) { manager.setCachedGroups(groups); }
 }