MM-52544 Fix missing reply bar mention highlight (#23534)

webapp/channels/src/sass/components/_post.scss

@@ -1122,11 +1122,12 @@
     &.post--comment {
         .post__body {
             padding-left: 7px;
-            border-left: 4px solid $gray;
+            border-left: 4px solid rgba(var(--center-channel-color-rgb), 0.2);
+        }
 
-            &.mention-comment {
-                border-color: $yellow;
-                border-left: 4px solid $yellow;
+        &.mention-comment {
+            .post__body {
+                border-left: 4px solid var(--mention-highlight-bg);
             }
         }
 

webapp/channels/src/utils/utils.tsx

@@ -406,7 +406,6 @@ export function applyTheme(theme: Theme) {
         changeCss('body', 'scrollbar-arrow-color:' + theme.centerChannelColor);
         changeCss('.app__body .post-create__container .post-create-body .btn-file svg, .app__body .post.post--compact .post-image__column .post-image__details svg, .app__body .modal .about-modal .about-modal__logo svg, .app__body .status svg, .app__body .edit-post__actions .icon svg', 'fill:' + theme.centerChannelColor);
         changeCss('.app__body .post-list__new-messages-below', 'background:' + changeColor(theme.centerChannelColor, 0.5));
-        changeCss('.app__body .post.post--comment .post__body', 'border-color:' + changeOpacity(theme.centerChannelColor, 0.2));
         changeCss('@media(min-width: 768px){.app__body .post.post--compact.same--root.post--comment .post__content', 'border-color:' + changeOpacity(theme.centerChannelColor, 0.2));
         changeCss('.app__body .post.post--comment.current--user .post__body', 'border-color:' + changeOpacity(theme.centerChannelColor, 0.2));
         changeCss('.app__body .emoji-picker', 'color:' + theme.centerChannelColor);
@@ -467,7 +466,6 @@ export function applyTheme(theme: Theme) {
 
     if (theme.mentionHighlightBg) {
         changeCss('.app__body .search-highlight', 'background:' + theme.mentionHighlightBg);
-        changeCss('.app__body .post.post--comment .post__body.mention-comment', 'border-color:' + theme.mentionHighlightBg);
         changeCss('.app__body .post.post--highlight', 'background:' + changeOpacity(theme.mentionHighlightBg, 0.5));
     }