fix content warning should delete when you hide it

routes/_actions/contentWarnings.js

@@ -2,5 +2,9 @@ import { store } from '../_store/store'
 
 export function toggleContentWarningShown (realm) {
   let shown = store.getComposeData(realm, 'contentWarningShown')
-  store.setComposeData(realm, {contentWarningShown: !shown})
+  let contentWarning = store.getComposeData(realm, 'contentWarning')
+  store.setComposeData(realm, {
+    contentWarning: shown ? contentWarning : '',
+    contentWarningShown: !shown
+  })
 }

tests/spec/015-compose-content-warnings.js

@@ -52,17 +52,17 @@ test('Considers content warnings for length limits', async t => {
     .expect(composeLengthIndicator.innerText).eql('500')
 })
 
-test('Considers hidden content warnings for length limits', async t => {
+test('Content warning goes away if you hide it', async t => {
   await t.useRole(foobarRole)
+    .click(contentWarningButton)
+    .expect(composeContentWarning.value).eql('')
+    .typeText(composeContentWarning, 'yo', {paste: true})
+    .expect(composeContentWarning.value).eql('yo')
+    .expect(composeLengthIndicator.innerText).eql('498')
+    .click(contentWarningButton)
+    .expect(composeContentWarning.exists).notOk()
     .expect(composeLengthIndicator.innerText).eql('500')
     .click(contentWarningButton)
-    .typeText(composeContentWarning, 'my content warning', {paste: true})
-    .expect(composeLengthIndicator.innerText).eql('482')
-    .click(contentWarningButton)
-    .expect(composeLengthIndicator.innerText).eql('500')
-    .click(contentWarningButton)
-    .expect(composeLengthIndicator.innerText).eql('482')
-    .selectText(composeContentWarning)
-    .pressKey('delete')
+    .expect(composeContentWarning.value).eql('')
     .expect(composeLengthIndicator.innerText).eql('500')
 })