Deprecate govuk-grid-row mixin

Wrapping the row functionality up in a mixin offers little other than the ability to use a custom name, but we’re not sure there’s a need for users to do that.

Simplify the code by deprecating the mixin and just using the code to create the concrete class directly.

See: alphagov/govuk-frontend#1090

Co-authored-by: Oliver Byford <oliver.byford@digital.cabinet-office.gov.uk>

Author: colinrotherham

packages/core/objects/_grid.scss

@@ -5,7 +5,12 @@
 ////
 
 @include nhsuk-exports("govuk/objects/grid") {
-  @include govuk-grid-row;
+  .nhsuk-grid-row {
+    @include clearfix;
+    margin-right: -($nhsuk-gutter-half);
+    margin-left: -($nhsuk-gutter-half);
+  }
+
   @include govuk-grid-column(one-quarter);
   @include govuk-grid-column(one-third);
   @include govuk-grid-column(one-half);

packages/core/tools/_grid.scss

@@ -41,15 +41,26 @@
 ///
 /// @example scss - Customising the class name
 ///   @include govuk-grid-row("app-grid");
+///
+/// @deprecated To be removed in v10.0, replaced by the nhsuk-grid-row class
 
-@mixin govuk-grid-row($class: "nhsuk-grid-row") {
+@mixin nhsuk-grid-row($class: "nhsuk-grid-row") {
   .#{$class} {
     @include clearfix;
     margin-left: -($nhsuk-gutter-half);
     margin-right: -($nhsuk-gutter-half);
   }
 }
 
+/// Generate grid row styles (deprecated)
+///
+/// @alias nhsuk-grid-row
+/// @deprecated To be removed in v10.0, replaced by the nhsuk-grid-row class
+
+@mixin govuk-grid-row($args...) {
+  @include nhsuk-grid-row($args...);
+}
+
 /// Generate grid column styles
 ///
 /// Creates a cross browser grid column with a class of '.govuk-grid-column' by