Delete envelopes from vuex state

Signed-off-by: Richard Steinmetz <richard@steinmetz.cloud>

src/store/mutations.js

@@ -231,6 +231,8 @@ export default {
 			const thread = env.thread.filter(threadId => threadId !== id)
 			Vue.set(state.envelopes[key], 'thread', thread)
 		}
+
+		Vue.delete(state.envelopes, id)
 	},
 	addMessage(state, { message }) {
 		Vue.set(state.messages, message.databaseId, message)

src/tests/unit/store/mutations.spec.js

@@ -871,11 +871,6 @@ describe('Vuex store mutations', () => {
 				},
 			},
 			envelopes: {
-				12345: {
-					mailboxId: 27,
-					id: 123,
-					uid: 12345,
-				},
 				12346: {
 					mailboxId: 27,
 					id: 123,