Use local fonts and stop scrollable elements from repainting (#2266)

app/assets/stylesheets/components.scss

@@ -1052,6 +1052,7 @@ a.status__content__spoiler-link {
   overflow-y: scroll;
   overflow-x: hidden;
   flex: 1 1 auto;
+  backface-visibility: hidden;
   -webkit-overflow-scrolling: touch;
 
   &.optionally-scrollable {

app/assets/stylesheets/fonts/montserrat.scss

 @font-face {
   font-family: 'Montserrat';
+  src: local('Montserrat');
   src: font-url('montserrat/Montserrat-Regular.eot');
   src: font-url('montserrat/Montserrat-Regular.eot?#iefix') format('embedded-opentype'),
   font-url('montserrat/Montserrat-Regular.woff2') format('woff2'),

app/assets/stylesheets/fonts/roboto-mono.scss

 @font-face {
   font-family: 'Roboto Mono';
+  src: local('Roboto Mono');
   src: font-url('roboto-mono/robotomono-regular-webfont.eot');
   src: font-url('roboto-mono/robotomono-regular-webfont.eot?#iefix') format('embedded-opentype'),
   font-url('roboto-mono/robotomono-regular-webfont.woff2') format('woff2'),

app/assets/stylesheets/fonts/roboto.scss

 @font-face {
-	font-family: 'Roboto';
-	src: font-url('roboto/roboto-italic-webfont.eot');
-	src: font-url('roboto/roboto-italic-webfont.eot?#iefix') format('embedded-opentype'),
-		font-url('roboto/roboto-italic-webfont.woff2') format('woff2'),
-		font-url('roboto/roboto-italic-webfont.woff') format('woff'),
-		font-url('roboto/roboto-italic-webfont.ttf') format('truetype'),
-		font-url('roboto/roboto-italic-webfont.svg#roboto-italic-webfont') format('svg');
-	font-weight: normal;
-	font-style: italic;
+  font-family: 'Roboto';
+  src: local('Roboto');
+  src: font-url('roboto/roboto-italic-webfont.eot');
+  src: font-url('roboto/roboto-italic-webfont.eot?#iefix') format('embedded-opentype'),
+    font-url('roboto/roboto-italic-webfont.woff2') format('woff2'),
+    font-url('roboto/roboto-italic-webfont.woff') format('woff'),
+    font-url('roboto/roboto-italic-webfont.ttf') format('truetype'),
+    font-url('roboto/roboto-italic-webfont.svg#roboto-italic-webfont') format('svg');
+  font-weight: normal;
+  font-style: italic;
 }
 
 @font-face {
-	font-family: 'Roboto';
-	src: font-url('roboto/roboto-bold-webfont.eot');
-	src: local('Roboto bold'), local('roboto-bold'),
-		font-url('roboto/roboto-bold-webfont.eot?#iefix') format('embedded-opentype'),
-		font-url('roboto/roboto-bold-webfont.woff2') format('woff2'),
-		font-url('roboto/roboto-bold-webfont.woff') format('woff'),
-		font-url('roboto/roboto-bold-webfont.ttf') format('truetype'),
-		font-url('roboto/roboto-bold-webfont.svg#roboto-bold-webfont') format('svg');
-	font-weight: bold;
-	font-style: normal;
+  font-family: 'Roboto';
+  src: local('Roboto');
+  src: font-url('roboto/roboto-bold-webfont.eot');
+  src: local('Roboto bold'), local('roboto-bold'),
+    font-url('roboto/roboto-bold-webfont.eot?#iefix') format('embedded-opentype'),
+    font-url('roboto/roboto-bold-webfont.woff2') format('woff2'),
+    font-url('roboto/roboto-bold-webfont.woff') format('woff'),
+    font-url('roboto/roboto-bold-webfont.ttf') format('truetype'),
+    font-url('roboto/roboto-bold-webfont.svg#roboto-bold-webfont') format('svg');
+  font-weight: bold;
+  font-style: normal;
 }
 
 @font-face {
-	font-family: 'Roboto';
-	src: font-url('roboto/roboto-medium-webfont.eot');
-	src: font-url('roboto/roboto-medium-webfont.eot?#iefix') format('embedded-opentype'),
-		font-url('roboto/roboto-medium-webfont.woff2') format('woff2'),
-		font-url('roboto/roboto-medium-webfont.woff') format('woff'),
-		font-url('roboto/roboto-medium-webfont.ttf') format('truetype'),
-		font-url('roboto/roboto-medium-webfont.svg#roboto-medium-webfont') format('svg');
-	font-weight: 500;
-	font-style: normal;
+  font-family: 'Roboto';
+  src: local('Roboto');
+  src: font-url('roboto/roboto-medium-webfont.eot');
+  src: font-url('roboto/roboto-medium-webfont.eot?#iefix') format('embedded-opentype'),
+    font-url('roboto/roboto-medium-webfont.woff2') format('woff2'),
+    font-url('roboto/roboto-medium-webfont.woff') format('woff'),
+    font-url('roboto/roboto-medium-webfont.ttf') format('truetype'),
+    font-url('roboto/roboto-medium-webfont.svg#roboto-medium-webfont') format('svg');
+  font-weight: 500;
+  font-style: normal;
 }
 
 @font-face {
-	font-family: 'Roboto';
-	src: font-url('roboto/roboto-regular-webfont.eot');
-	src: font-url('roboto/roboto-regular-webfont.eot?#iefix') format('embedded-opentype'),
-		font-url('roboto/roboto-regular-webfont.woff2') format('woff2'),
-		font-url('roboto/roboto-regular-webfont.woff') format('woff'),
-		font-url('roboto/roboto-regular-webfont.ttf') format('truetype'),
-		font-url('roboto/roboto-regular-webfont.svg#roboto-regular-webfont') format('svg');
-	font-weight: normal;
-	font-style: normal;
+  font-family: 'Roboto';
+  src: local('Roboto');
+  src: font-url('roboto/roboto-regular-webfont.eot');
+  src: font-url('roboto/roboto-regular-webfont.eot?#iefix') format('embedded-opentype'),
+    font-url('roboto/roboto-regular-webfont.woff2') format('woff2'),
+    font-url('roboto/roboto-regular-webfont.woff') format('woff'),
+    font-url('roboto/roboto-regular-webfont.ttf') format('truetype'),
+    font-url('roboto/roboto-regular-webfont.svg#roboto-regular-webfont') format('svg');
+  font-weight: normal;
+  font-style: normal;
 }