feat(menu): Introduce mixins and base style for menu selection group …

…title

PiperOrigin-RevId: 524315087

packages/mdc-menu/_menu.scss

@@ -35,6 +35,7 @@
 @use '@material/theme/theme';
 @use '@material/theme/custom-properties';
 @use './menu-custom-properties';
+@use '@material/typography/typography';
 @use './variables';
 
 /// @deprecated Use static-styles() instead.
@@ -139,6 +140,17 @@
   }
   // postcss-bem-linter: end
 
+  .mdc-menu__selection-group-title {
+    @include feature-targeting.targets($feat-structure) {
+      align-items: center;
+      display: flex;
+    }
+  }
+
+  .mdc-menu__selection-group-title-text {
+    @include typography.overflow-ellipsis();
+  }
+
   .mdc-menu-item--selected .mdc-menu__selection-group-icon {
     @include feature-targeting.targets($feat-structure) {
       display: inline;
@@ -192,3 +204,37 @@
     @include theme.property(min-width, $min-width-custom-property);
   }
 }
+
+@mixin selection-group-title-spacing(
+  $leading,
+  $trailing: $leading,
+  $query: feature-targeting.all()
+) {
+  $feat-structure: feature-targeting.create-target($query, structure);
+
+  @include feature-targeting.targets($feat-structure) {
+    .mdc-menu__selection-group-title {
+      @include rtl.reflexive-property(margin, $leading, $trailing);
+    }
+  }
+}
+
+@mixin selection-group-title-height($height, $query: feature-targeting.all()) {
+  $feat-structure: feature-targeting.create-target($query, structure);
+
+  @include feature-targeting.targets($feat-structure) {
+    .mdc-menu__selection-group-title {
+      @include theme.property(height, $height);
+    }
+  }
+}
+
+@mixin selection-group-title-color($color, $query: feature-targeting.all()) {
+  $feat-color: feature-targeting.create-target($query, color);
+
+  .mdc-menu__selection-group-title {
+    @include feature-targeting.targets($feat-color) {
+      @include theme.property(color, $color);
+    }
+  }
+}

packages/mdc-menu/_mixins.scss

@@ -21,4 +21,4 @@
 //
 
 /// @deprecated Import '_menu.scss' instead.
-@forward './menu' show core-styles, open-item-opacity, width, min-width;
+@forward './menu' hide static-styles;