Vectorize mini avatar uploader spinner

Signed-off-by: Robin Townsend <robin@robin.town>

res/css/views/elements/_MiniAvatarUploader.scss

@@ -28,8 +28,7 @@ limitations under the License.
         top: 0;
     }
 
-    &::before, &::after {
-        content: '';
+    .mx_MiniAvatarUploader_indicator {
         position: absolute;
 
         height: 26px;
@@ -37,15 +36,15 @@ limitations under the License.
 
         right: -6px;
         bottom: -6px;
-    }
 
-    &::before {
         background-color: $primary-bg-color;
         border-radius: 50%;
         z-index: 1;
-    }
 
-    &::after {
+        .mx_MiniAvatarUploader_cameraIcon {
+            height: 100%;
+            width: 100%;
+
             background-color: $secondary-fg-color;
             mask-position: center;
             mask-repeat: no-repeat;
@@ -53,11 +52,6 @@ limitations under the License.
             mask-size: 16px;
             z-index: 2;
         }
-
-    &.mx_MiniAvatarUploader_busy::after {
-        background: url("$(res)/img/spinner.gif") no-repeat center;
-        background-size: 80%;
-        mask: unset;
     }
 }
 

res/css/views/rooms/_NewRoomIntro.scss

@@ -18,8 +18,8 @@ limitations under the License.
     margin: 40px 0 48px 64px;
 
     .mx_MiniAvatarUploader_hasAvatar:not(.mx_MiniAvatarUploader_busy):not(:hover) {
-        &::before, &::after {
-            content: unset;
+        .mx_MiniAvatarUploader_indicator {
+            display: none;
         }
     }
 

src/components/views/elements/MiniAvatarUploader.tsx

@@ -19,6 +19,7 @@ import {EventType} from 'matrix-js-sdk/src/@types/event';
 import classNames from 'classnames';
 
 import AccessibleButton from "./AccessibleButton";
+import Spinner from "./Spinner";
 import MatrixClientContext from "../../../contexts/MatrixClientContext";
 import {useTimeout} from "../../../hooks/useTimeout";
 import Analytics from "../../../Analytics";
@@ -88,6 +89,12 @@ const MiniAvatarUploader: React.FC<IProps> = ({ hasAvatar, hasAvatarLabel, noAva
         >
             { children }
 
+            <div className="mx_MiniAvatarUploader_indicator">
+                { busy ?
+                    <Spinner w={20} h={20} /> :
+                    <div className="mx_MiniAvatarUploader_cameraIcon"></div> }
+            </div>
+
             <div className={classNames("mx_Tooltip", {
                 "mx_Tooltip_visible": visible,
                 "mx_Tooltip_invisible": !visible,