fix(multiple): avoid repeating selectors in m3 themes (#30645)

Author: andrewseguin

src/dev-app/theme-m3.scss

@@ -35,6 +35,10 @@ html {
   color-scheme: light;
   body:not(.demo-experimental-theme) {
     @include mat.all-component-themes($light-theme);
+    @include mat.checkbox-overrides((
+      disabled-label-color: orange,
+      label-text-color: red,
+    ));
     @include mat.system-level-colors($light-theme);
     @include mat.system-level-typography($light-theme);
     // TODO(mmalerba): Support M3 for experimental components.

src/material/autocomplete/_autocomplete-theme.scss

@@ -12,7 +12,7 @@
     @include _theme-from-tokens(inspection.get-theme-tokens($theme, base));
   } @else {
     @include sass-utils.current-selector-or-root() {
-      @include token-utils.create-token-values(
+      @include token-utils.create-token-values-mixed(
         tokens-mat-autocomplete.$prefix,
         tokens-mat-autocomplete.get-unthemable-tokens()
       );
@@ -25,7 +25,7 @@
     @include _theme-from-tokens(inspection.get-theme-tokens($theme, color));
   } @else {
     @include sass-utils.current-selector-or-root() {
-      @include token-utils.create-token-values(
+      @include token-utils.create-token-values-mixed(
         tokens-mat-autocomplete.$prefix,
         tokens-mat-autocomplete.get-color-tokens($theme)
       );
@@ -38,7 +38,7 @@
     @include _theme-from-tokens(inspection.get-theme-tokens($theme, typography));
   } @else {
     @include sass-utils.current-selector-or-root() {
-      @include token-utils.create-token-values(
+      @include token-utils.create-token-values-mixed(
         tokens-mat-autocomplete.$prefix,
         tokens-mat-autocomplete.get-typography-tokens($theme)
       );
@@ -51,7 +51,7 @@
     @include _theme-from-tokens(inspection.get-theme-tokens($theme, density));
   } @else {
     @include sass-utils.current-selector-or-root() {
-      @include token-utils.create-token-values(
+      @include token-utils.create-token-values-mixed(
         tokens-mat-autocomplete.$prefix,
         tokens-mat-autocomplete.get-density-tokens($theme)
       );