Merge branch 'master' into simeonoff/fix-7455

Author: simeonoff

projects/igniteui-angular/src/lib/core/styles/components/button-group/_button-group-theme.scss

@@ -187,6 +187,13 @@
         box-shadow: --var($theme, 'shadow');
         transition: $transition;
         border-radius: --var($theme, 'border-radius');
+
+        button {
+            // The margin here is required to fix a bug in Safari #7858
+            margin-top: 0;
+            margin-#{$right}: 0;
+            margin-bottom: 0;
+        }
     }
 
     %igx-group-item {