Client Tasks v3 (#8926)

* tasks hover state

* hide column background if task too close

* wip edit tasks

* wip: replace tags

* upgrade bootstrap-vue and fix creare btn for tasks

* difficulty options colors and active label fixes

* fix tags

website/server/models/tag.js

@@ -22,8 +22,14 @@ export let schema = new Schema({
 });
 
 schema.plugin(baseModel, {
-  noSet: ['_id', 'id', 'challenge'],
+  noSet: ['_id', 'challenge', 'group'],
   _id: false, // use id instead of _id
 });
 
+// A list of additional fields that cannot be updated (but can be set on creation)
+const noUpdate = ['id'];
+schema.statics.sanitizeUpdate = function sanitizeUpdate (updateObj) {
+  return this.sanitize(updateObj, noUpdate);
+};
+
 export let model = mongoose.model('Tag', schema);