Fix Safari display issues #3192

- Fix Inspector `__content` to properly use flex column layout;
- Change `u-angular-object-view-wrapper` to `display: contents`;
- Fix `gl-plot` to properly use `flex: 1 1 auto` instead of width and
height;

src/ui/components/object-frame.scss

@@ -74,11 +74,9 @@
         height: 0; // Chrome 73 overflow bug fix
         overflow: auto;
 
-        .u-angular-object-view-wrapper {
-            .u-fills-container {
-                // Expand component types that fill a container
-                @include abs();
-            }
+        .u-fills-container {
+            // Expand component types that fill a container
+            @include abs();
         }
     }
 
@@ -91,8 +89,5 @@
 }
 
 .u-angular-object-view-wrapper {
-    flex: 1 1 auto;
-    height: 100%;
-    width: 100%;
-    overflow: hidden;
+    display: contents;
 }