Automatically tick sensitive if a subject line is specified

also adds a warning

src/components/post_status_form/post_status_form.js

@@ -281,8 +281,6 @@ const PostStatusForm = {
       if (this.preview) this.previewStatus()
     },
     async postStatus (event, newStatus, opts = {}) {
-      const { sensitiveIfSubject } = this.$store.getters.mergedConfig
-
       if (this.posting && !this.optimisticPosting) { return }
       if (this.disableSubmit) { return }
       if (this.emojiInputShown) { return }
@@ -318,7 +316,7 @@ const PostStatusForm = {
         status: newStatus.status,
         spoilerText: newStatus.spoilerText || null,
         visibility: newStatus.visibility,
-        sensitive: (newStatus.nsfw || (sensitiveIfSubject && newStatus.spoilerText)),
+        sensitive: newStatus.nsfw,
         media: newStatus.files,
         store: this.$store,
         inReplyToStatusId: this.replyTo,
@@ -392,6 +390,10 @@ const PostStatusForm = {
     },
     addMediaFile (fileInfo) {
       this.newStatus.files.push(fileInfo)
+
+      if (this.newStatus.sensitiveIfSubject && this.newStatus.spoilerText !== '') {
+        this.newStatus.nsfw = true
+      }
       this.$emit('resize', { delayed: true })
     },
     removeMediaFile (fileInfo) {
@@ -468,6 +470,11 @@ const PostStatusForm = {
         this.resize(this.$refs['textarea'])
       })
     },
+    onSubjectInput (e) {
+      if (this.newStatus.sensitiveIfSubject) {
+        this.newStatus.nsfw = true
+      }
+    },
     resize (e) {
       const target = e.target || e
       if (!(target instanceof window.Element)) { return }

src/components/post_status_form/post_status_form.vue

@@ -124,8 +124,18 @@
             :disabled="posting && !optimisticPosting"
             size="1"
             class="form-post-subject"
+            @input="onSubjectInput"
           >
         </EmojiInput>
+        <i18n-t
+          v-if="newStatus.files.length !== 0 && newStatus.nsfw === false && newStatus.spoilerText !== ''"
+          keypath="post_status.media_not_sensitive_warning"
+          tag="p"
+          class="visibility-notice"
+          scope="global"
+        >
+          {{ $t('post_status.media_not_sensitive_warning') }}
+        </i18n-t>
         <EmojiInput
           ref="emoji-input"
           v-model="newStatus.status"

src/i18n/en.json

@@ -204,6 +204,7 @@
     "new_status": "Post new status",
     "account_not_locked_warning": "Your account is not {0}. Anyone can follow you to view your follower-only posts.",
     "account_not_locked_warning_link": "locked",
+    "media_not_sensitive_warning": "You have a Content Warning, but the attachments are not marked as sensitive!",
     "attachments_sensitive": "Mark attachments as sensitive",
     "media_description": "Media description",
     "content_type": {