Dynamicaly change avatar and header bg from account setting (#4289)

app/javascript/packs/public.js

@@ -88,6 +88,20 @@ function main() {
       noteCounter.textContent = 160 - length(target.value);
     }
   });
+
+  delegate(document, '#account_avatar', 'change', ({ target }) => {
+    const avatar = document.querySelector('.card.compact .avatar img');
+    const [file] = target.files || [];
+    const url = URL.createObjectURL(file);
+    avatar.src = url;
+  });
+
+  delegate(document, '#account_header', 'change', ({ target }) => {
+    const header = document.querySelector('.card.compact');
+    const [file] = target.files || [];
+    const url = URL.createObjectURL(file);
+    header.style.backgroundImage = `url(${url})`;
+  });
 }
 
 loadPolyfills().then(main).catch(error => {

app/javascript/styles/accounts.scss

@@ -32,6 +32,10 @@
 
     .avatar {
       margin-bottom: 0;
+
+      img {
+        object-fit: cover;
+      }
     }
   }