Fix popovers cutting off in notifications #809

fixes #809 (closed) and also copies over the new popover improvements from chats mr by @eugenijm to debloat that review a tiny bit

the ellipsis menu popover as well as account extra actions had the problem, so I fixed it in both

in notifications:

and when there's space:

src/components/post_status_form/post_status_form.vue

@@ -81,6 +81,7 @@
             v-model="newStatus.spoilerText"
             type="text"
             :placeholder="$t('post_status.content_warning')"
+            :disabled="posting"
             class="form-post-subject"
           >
         </EmojiInput>