Fix focus mode on boards

app/assets/stylesheets/page_bundles/boards.scss

@@ -430,7 +430,7 @@
   height: $input-height;
 }
 
-.issue-boards-content {
+.issue-boards-content:not(.breadcrumbs) {
   isolation: isolate;
 }
 

app/views/shared/boards/_show.html.haml

@@ -2,7 +2,7 @@
 - @no_breadcrumb_container = true
 - @no_container = true
 - @content_wrapper_class = "#{@content_wrapper_class} gl-relative"
-- @content_class = "js-focus-mode-board"
+- @content_class = "issue-boards-content js-focus-mode-board"
 - is_epic_board = board.to_type == "EpicBoard"
 - if is_epic_board
   - breadcrumb_title _("Epic Boards")

qa/qa/page/component/issue_board/show.rb

@@ -48,7 +48,7 @@ module QA
           # with the attribute `data-qa-selector` since such element is not unique when the
           # `is-focused` class is not set, and it was not possible to find a better solution.
           def focused_board
-            find('.js-focus-mode-board.is-focused')
+            find('.issue-boards-content.js-focus-mode-board.is-focused')
           end
 
           def boards_dropdown