diff --git a/app/javascript/mastodon/features/account_gallery/components/media_item.js b/app/javascript/mastodon/features/account_gallery/components/media_item.js
index 8d462996e..5643e6449 100644
--- a/app/javascript/mastodon/features/account_gallery/components/media_item.js
+++ b/app/javascript/mastodon/features/account_gallery/components/media_item.js
@@ -133,7 +133,7 @@ export default class MediaItem extends ImmutablePureComponent {
 
     return (
       <div className='account-gallery__item' style={{ width, height }}>
-        <a className='media-gallery__item-thumbnail' href={status.get('url')} target='_blank' style={{ cursor: 'pointer' }} onClick={this.handleClick}>
+        <a className='media-gallery__item-thumbnail' href={status.get('url')} target='_blank' onClick={this.handleClick}>
           <canvas width={32} height={32} ref={this.setCanvasRef} className={classNames('media-gallery__preview', { 'media-gallery__preview--hidden': visible && loaded })} />
           {visible && thumbnail}
         </a>
diff --git a/app/javascript/mastodon/features/ui/index.js b/app/javascript/mastodon/features/ui/index.js
index c14eba992..1fcea779d 100644
--- a/app/javascript/mastodon/features/ui/index.js
+++ b/app/javascript/mastodon/features/ui/index.js
@@ -47,7 +47,8 @@ import {
   Lists,
 } from './util/async-components';
 import { me } from '../../initial_state';
-import { previewState } from './components/media_modal';
+import { previewState as previewMediaState } from './components/media_modal';
+import { previewState as previewVideoState } from './components/video_modal';
 
 // Dummy import, to make sure that <Status /> ends up in the application bundle.
 // Without this it ends up in ~8 very commonly used bundles.
@@ -121,7 +122,7 @@ class SwitchingColumnsArea extends React.PureComponent {
   }
 
   shouldUpdateScroll (_, { location }) {
-    return location.state !== previewState;
+    return location.state !== previewMediaState && location.state !== previewVideoState;
   }
 
   handleResize = debounce(() => {
diff --git a/app/javascript/styles/mastodon/admin.scss b/app/javascript/styles/mastodon/admin.scss
index 05c7821e4..74f91599a 100644
--- a/app/javascript/styles/mastodon/admin.scss
+++ b/app/javascript/styles/mastodon/admin.scss
@@ -50,6 +50,7 @@ $content-width: 840px;
         color: $darker-text-color;
         text-decoration: none;
         transition: all 200ms linear;
+        transition-property: color, background-color;
         border-radius: 4px 0 0 4px;
 
         i.fa {
@@ -60,6 +61,7 @@ $content-width: 840px;
           color: $primary-text-color;
           background-color: darken($ui-base-color, 5%);
           transition: all 100ms linear;
+          transition-property: color, background-color;
         }
 
         &.selected {
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 5c6f1a6f6..1ba6fa5b1 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -1972,6 +1972,7 @@ a.account__display-name {
   font-weight: 500;
   border-bottom: 2px solid lighten($ui-base-color, 8%);
   transition: all 50ms linear;
+  transition-property: border-bottom, background, color;
 
   .fa {
     font-weight: 400;
@@ -2137,7 +2138,7 @@ a.account__display-name {
   padding: 0;
   border-radius: 30px;
   background-color: $ui-base-color;
-  transition: all 0.2s ease;
+  transition: background-color 0.2s ease;
 }
 
 .react-toggle:hover:not(.react-toggle--disabled) .react-toggle-track {
@@ -2190,7 +2191,6 @@ a.account__display-name {
 }
 
 .react-toggle-thumb {
-  transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1) 0ms;
   position: absolute;
   top: 1px;
   left: 1px;
@@ -2201,6 +2201,7 @@ a.account__display-name {
   background-color: darken($simple-background-color, 2%);
   box-sizing: border-box;
   transition: all 0.25s ease;
+  transition-property: border-color, left;
 }
 
 .react-toggle--checked .react-toggle-thumb {
@@ -3552,6 +3553,7 @@ a.status-card.compact:hover {
     display: inline-block;
     opacity: 0;
     transition: all 100ms linear;
+    transition-property: transform, opacity;
     font-size: 18px;
     width: 18px;
     height: 18px;
diff --git a/lib/mastodon/version.rb b/lib/mastodon/version.rb
index c825e7629..5ea569b29 100644
--- a/lib/mastodon/version.rb
+++ b/lib/mastodon/version.rb
@@ -46,7 +46,7 @@ module Mastodon
 
     # specify git tag or commit hash here
     def source_tag
-      nil
+      ENV.fetch('SOURCE_TAG') { nil }
     end
 
     def source_url