Fix display issues of carousel child elements in contextual light and dark modes (#40695)

Co-authored-by: Louis-Maxime Piton <[email protected]>

Author: julien-deramond

scss/_carousel.scss

@@ -99,6 +99,7 @@
   color: $carousel-control-color;
   text-align: center;
   background: none;
+  filter: var(--#{$prefix}carousel-control-icon-filter);
   border: 0;
   opacity: $carousel-control-opacity;
   @include transition($carousel-control-transition);
@@ -168,7 +169,7 @@
     margin-left: $carousel-indicator-spacer;
     text-indent: -999px;
     cursor: pointer;
-    background-color: $carousel-indicator-active-bg;
+    background-color: var(--#{$prefix}carousel-indicator-active-bg);
     background-clip: padding-box;
     border: 0;
     // Use transparent borders to increase the hit area by 10px on top and bottom.
@@ -195,42 +196,31 @@
   left: (100% - $carousel-caption-width) * .5;
   padding-top: $carousel-caption-padding-y;
   padding-bottom: $carousel-caption-padding-y;
-  color: $carousel-caption-color;
+  color: var(--#{$prefix}carousel-caption-color);
   text-align: center;
 }
 
 // Dark mode carousel
 
 @mixin carousel-dark() {
-  .carousel-control-prev-icon,
-  .carousel-control-next-icon {
-    filter: $carousel-dark-control-icon-filter;
-  }
-
-  .carousel-indicators [data-bs-target] {
-    background-color: $carousel-dark-indicator-active-bg;
-  }
-
-  .carousel-caption {
-    color: $carousel-dark-caption-color;
-  }
+  --#{$prefix}carousel-indicator-active-bg: #{$carousel-indicator-active-bg-dark};
+  --#{$prefix}carousel-caption-color: #{$carousel-caption-color-dark};
+  --#{$prefix}carousel-control-icon-filter: #{$carousel-control-icon-filter-dark};
 }
 
 .carousel-dark {
   @include carousel-dark();
 }
 
+:root,
+[data-bs-theme="light"] {
+  --#{$prefix}carousel-indicator-active-bg: #{$carousel-indicator-active-bg};
+  --#{$prefix}carousel-caption-color: #{$carousel-caption-color};
+  --#{$prefix}carousel-control-icon-filter: #{$carousel-control-icon-filter};
+}
+
 @if $enable-dark-mode {
-  @include color-mode(dark) {
-    @if $color-mode-type == "media-query" {
-      .carousel {
-        @include carousel-dark();
-      }
-    } @else {
-      .carousel,
-      &.carousel {
-        @include carousel-dark();
-      }
-    }
+  @include color-mode(dark, true) {
+    @include carousel-dark();
   }
 }

scss/_variables-dark.scss

@@ -85,3 +85,12 @@ $accordion-icon-active-color-dark:  $primary-text-emphasis-dark !default;
 $accordion-button-icon-dark:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-color-dark}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708'/></svg>") !default;
 $accordion-button-active-icon-dark:  url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-active-color-dark}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708'/></svg>") !default;
 // scss-docs-end sass-dark-mode-vars
+
+
+//
+// Carousel
+//
+
+$carousel-indicator-active-bg-dark:   $carousel-dark-indicator-active-bg !default;
+$carousel-caption-color-dark:         $carousel-dark-caption-color !default;
+$carousel-control-icon-filter-dark:   $carousel-dark-control-icon-filter !default;

scss/_variables.scss

@@ -1652,6 +1652,7 @@ $carousel-control-width:             15% !default;
 $carousel-control-opacity:           .5 !default;
 $carousel-control-hover-opacity:     .9 !default;
 $carousel-control-transition:        opacity .15s ease !default;
+$carousel-control-icon-filter:       null !default;
 
 $carousel-indicator-width:           30px !default;
 $carousel-indicator-height:          3px !default;
@@ -1677,9 +1678,9 @@ $carousel-transition:                transform $carousel-transition-duration eas
 // scss-docs-end carousel-variables
 
 // scss-docs-start carousel-dark-variables
-$carousel-dark-indicator-active-bg:  $black !default;
-$carousel-dark-caption-color:        $black !default;
-$carousel-dark-control-icon-filter:  invert(1) grayscale(100) !default;
+$carousel-dark-indicator-active-bg:  $black !default; // Deprecated in v5.3.4
+$carousel-dark-caption-color:        $black !default; // Deprecated in v5.3.4
+$carousel-dark-control-icon-filter:  invert(1) grayscale(100) !default; // Deprecated in v5.3.4
 // scss-docs-end carousel-dark-variables