Compose: preliminary toast upon submission

app/soapbox/actions/compose.js

@@ -72,6 +72,7 @@ const messages = defineMessages({
   uploadErrorLimit: { id: 'upload_error.limit', defaultMessage: 'File upload limit exceeded.' },
   uploadErrorPoll:  { id: 'upload_error.poll', defaultMessage: 'File upload not allowed with polls.' },
   scheduleError: { id: 'compose.invalid_schedule', defaultMessage: 'You must schedule a post at least 5 minutes out.'  },
+  success: { id: 'compose.submit_success', defaultMessage: 'Your post was sent' },
 });
 
 const COMPOSE_PANEL_BREAKPOINT = 600 + (285 * 1) + (10 * 1);
@@ -154,6 +155,7 @@ export function handleComposeSubmit(dispatch, getState, data, status) {
 
   dispatch(insertIntoTagHistory(data.tags || [], status));
   dispatch(submitComposeSuccess({ ...data }));
+  dispatch(snackbar.show('post', messages.success));
 }
 
 const needsDescriptions = state => {

app/soapbox/actions/snackbar.js

@@ -1,6 +1,6 @@
 import { ALERT_SHOW } from './alerts';
 
-const show = (severity, message) => ({
+export const show = (severity, message) => ({
   type: ALERT_SHOW,
   message,
   severity,
@@ -22,4 +22,5 @@ export default {
   info,
   success,
   error,
+  show,
 };

app/styles/components/snackbar.scss

@@ -32,6 +32,10 @@
     }
   }
 
+  &--post {
+    background-color: #0482d8 !important;
+  }
+
   &--success {
     background-color: #199e5a !important;