Multiple UI Improvements (#3804)

* PLT-3834 - Updating Manage members modal for mobile

* PLT-3792 - Making compact view compatible with search and flagged posts RHS

* PLT-3910 - Improving suggestions separator

* PLT-3769 - Enabling markdown headings in compact view

* Updating view members text in en..json

* Removing shouldcomponentupdate from search_results_item.jsx

webapp/utils/utils.jsx

@@ -547,7 +547,7 @@ export function applyTheme(theme) {
 
     if (theme.centerChannelBg) {
         changeCss('@media(min-width: 768px){.app__body .post:hover .post__header .col__reply, .app__body .post.post--hovered .post__header .col__reply', 'background:' + theme.centerChannelBg, 1);
-        changeCss('.app__body .app__content, .app__body .markdown__table, .app__body .markdown__table tbody tr, .app__body .suggestion-list__content, .app__body .modal .modal-content, .app__body .post.post--compact .post-image__column', 'background:' + theme.centerChannelBg, 1);
+        changeCss('.app__body .app__content, .app__body .markdown__table, .app__body .markdown__table tbody tr, .app__body .suggestion-list__content, .app__body .modal .modal-content, .app__body .post.post--compact .post-image__column, .app__body .suggestion-list__divider > span', 'background:' + theme.centerChannelBg, 1);
         changeCss('#post-list .post-list-holder-by-time', 'background:' + theme.centerChannelBg, 1);
         changeCss('#post-create', 'background:' + theme.centerChannelBg, 1);
         changeCss('.app__body .date-separator .separator__text, .app__body .new-separator .separator__text', 'background:' + theme.centerChannelBg, 1);
@@ -593,7 +593,7 @@ export function applyTheme(theme) {
         changeCss('.app__body .popover.left>.arrow', 'border-left-color:' + changeOpacity(theme.centerChannelColor, 0.25), 1);
         changeCss('.app__body .popover.top>.arrow', 'border-top-color:' + changeOpacity(theme.centerChannelColor, 0.25), 1);
         changeCss('.app__body .suggestion-list__content .command, .app__body .popover .popover-title', 'border-color:' + changeOpacity(theme.centerChannelColor, 0.2), 1);
-        changeCss('.app__body .dropdown-menu .divider, .app__body .search-help-popover .search-autocomplete__divider:before', 'background:' + theme.centerChannelColor, 1);
+        changeCss('.app__body .suggestion-list__divider:before, .app__body .dropdown-menu .divider, .app__body .search-help-popover .search-autocomplete__divider:before', 'background:' + theme.centerChannelColor, 1);
         changeCss('.app__body .custom-textarea', 'color:' + theme.centerChannelColor, 1);
         changeCss('.app__body .post-image__column', 'border-color:' + changeOpacity(theme.centerChannelColor, 0.2), 2);
         changeCss('.app__body .post-image__details', 'color:' + theme.centerChannelColor, 2);