Fix 6.93 with brackground image breaks scrolling on lists within swimlanes.

Thanks to xet7 !

Fixes #4936

client/components/sidebar/sidebar.js

@@ -694,9 +694,8 @@ BlazeComponent.extendComponent({
         'click .js-remove-background-image'() {
           const currentBoard = Boards.findOne(Session.get('currentBoard'));
           currentBoard.setBackgroundImageURL("");
-          Utils.setBackgroundImage("");
           Popup.back();
-          //Utils.reload();
+          Utils.reload();
           event.preventDefault();
         },
       },

client/components/swimlanes/swimlanes.css

@@ -47,7 +47,8 @@
   display: flex;
   flex-direction: row;
   overflow: 0;
-  max-height: calc(100% - 26px);
+  /* max-height: calc(100% - 26px); */
+  max-height: calc(400px);
 }
 .swimlane.placeholder {
   background-color: rgba(0,0,0,0.2);

client/lib/utils.js

@@ -1,27 +1,20 @@
 Utils = {
   setBackgroundImage(url) {
     const currentBoard = Boards.findOne(Session.get('currentBoard'));
-    if (url !== currentBoard.backgroundImageURL) {
-      if (url) {
+/*
+    if(url) {
+      if (url !== currentBoard.backgroundImageURL) {
         currentBoard.setBackgroundImageURL(url);
       } else {
         currentBoard.setBackgroundImageURL("");
       }
     }
-    if (url) {
-      $(".board-wrapper,.board-wrapper .board-canvas").css({"background":"url(" + url + ")","background-size":"cover"});
-      $(".minicard").css({"padding":"8px 8px 2px","box-shadow":"0 2px 3px rgba(0, 0, 0, 0.37)"});
-      $(".minicard .minicard-members,.minicard .minicard-assignees,.minicard .minicard-creator").css({"margin": "12px -0px 0px 5px"});
-      $(".list").css({"margin":"8px","height":"fit-content","border-left":"none","border-radius":"3px"});
-      $(".list-header-add").css({"padding":"10px 12px 4px"});
-      $(".list-header").css({"padding":"15px 12px 4px","border-top-left-radius":"3px","border-top-right-radius":"3px"});
-      $(".list-header .list-header-name").css({"font-size":"15px","line-height":"15px"});
-      $(".list-header .list-header-menu").css({"padding":"none"});
-      $("#header #header-main-bar .board-header-btn").css({"padding":"2px","margin":"0 5px"});
-      $(".swimlane").css({"background":"none"});
-      $(".board-canvas").css({"background":"none"});
+*/
+    if (currentBoard.backgroundImageURL) {
+      $(".board-wrapper,.board-wrapper .board-canvas").css({"background":"url(" + currentBoard.backgroundImageURL + ")","background-size":"cover"});
+      $(".swimlane,.swimlane .list,.swimlane .list .list-body,.swimlane .list:first-child .list-body").css({"background-color":"transparent"});
     } else {
-      $(".board-wrapper,.board-wrapper .board-canvas").css({"background": currentBoard.background.color});
+      $(".board-wrapper,.board-wrapper .board-canvas").css({"background": currentBoard.background-color});
     }
   },
   /** returns the current board id