Reset preview image if avatar/header image selection was cancelled (#4893)

app/javascript/packs/public.js

@@ -124,7 +124,7 @@ function main() {
   delegate(document, '#account_avatar', 'change', ({ target }) => {
     const avatar = document.querySelector('.card.compact .avatar img');
     const [file] = target.files || [];
-    const url = URL.createObjectURL(file);
+    const url = file ? URL.createObjectURL(file) : avatar.dataset.originalSrc;
 
     avatar.src = url;
   });
@@ -132,7 +132,7 @@ function main() {
   delegate(document, '#account_header', 'change', ({ target }) => {
     const header = document.querySelector('.card.compact');
     const [file] = target.files || [];
-    const url = URL.createObjectURL(file);
+    const url = file ? URL.createObjectURL(file) : header.dataset.originalSrc;
 
     header.style.backgroundImage = `url(${url})`;
   });

app/views/settings/profiles/show.html.haml

@@ -8,8 +8,8 @@
     = f.input :display_name, placeholder: t('simple_form.labels.defaults.display_name'), hint: t('simple_form.hints.defaults.display_name', count: 30 - @account.display_name.size).html_safe
     = f.input :note, placeholder: t('simple_form.labels.defaults.note'), hint: t('simple_form.hints.defaults.note', count: 160 - @account.note.size).html_safe
 
-  .card.compact{ style: "background-image: url(#{@account.header.url(:original)})" }
+  .card.compact{ style: "background-image: url(#{@account.header.url(:original)})", data: { original_src: @account.header.url(:original) } }
-    .avatar= image_tag @account.avatar.url(:original)
+    .avatar= image_tag @account.avatar.url(:original), data: { original_src: @account.avatar.url(:original) }
 
   .fields-group
     = f.input :avatar, wrapper: :with_label, input_html: { accept: AccountAvatar::IMAGE_MIME_TYPES.join(',') }, hint: t('simple_form.hints.defaults.avatar')