Issue #3360245 by mherchel, lauriii, longwave: Black bar appears (then...

Issue #3360245 by mherchel, lauriii, longwave: Black bar appears (then disappears) at top of viewport when navigating

(cherry picked from commit b94dfc58)

core/themes/claro/css/components/toolbar.module.css

@@ -97,11 +97,7 @@
  * style to avoid extra reflow & flicker. */
 @media (min-width: 61em) {
   .toolbar-loading.toolbar-horizontal .toolbar .toolbar-bar .toolbar-tab:last-child .toolbar-tray {
-    position: relative;
-    z-index: -999;
-    display: block;
-    visibility: hidden;
-    width: 1px;
+    display: none;
   }
 }
 /* Position the admin toolbar fixed when the configured standard breakpoint is

core/themes/claro/css/components/toolbar.module.pcss.css

@@ -104,11 +104,7 @@
  * style to avoid extra reflow & flicker. */
 @media (min-width: 61em) {
   .toolbar-loading.toolbar-horizontal .toolbar .toolbar-bar .toolbar-tab:last-child .toolbar-tray {
-    position: relative;
-    z-index: -999;
-    display: block;
-    visibility: hidden;
-    width: 1px;
+    display: none;
   }
 }
 

core/themes/stable9/css/toolbar/toolbar.module.css

@@ -83,11 +83,7 @@
  * style to avoid extra reflow & flicker. */
 @media (min-width: 61em) {
   .toolbar-loading.toolbar-horizontal .toolbar .toolbar-bar .toolbar-tab:last-child .toolbar-tray {
-    position: relative;
-    z-index: -999;
-    display: block;
-    visibility: hidden;
-    width: 1px;
+    display: none;
   }
   .toolbar-loading.toolbar-horizontal .toolbar .toolbar-bar .toolbar-tab:last-child .toolbar-tray .toolbar-lining {
     width: 999em;