Fix drag-and-drop and scrolling on mobile devices

Use drag handles on "miniscreens" whenever useful, this is especially useful on
mobile device. This should hopefully fix https://github.com/wekan/wekan/issues/2947.
While at it, simplify the condition

 Utils.isMiniScreen() ||
   (!Utils.isMiniScreen() && showDesktopDragHandles)

 to

  Utils.isMiniScreen() || showDesktopDragHandle

client/components/boards/boardBody.js

@@ -205,7 +205,7 @@ BlazeComponent.extendComponent({
       } else {
         showDesktopDragHandles = false;
       }
-      if (!Utils.isMiniScreen() && showDesktopDragHandles) {
+      if (Utils.isMiniScreen() || showDesktopDragHandles) {
         $swimlanesDom.sortable({
           handle: '.js-swimlane-header-handle',
         });
@@ -215,9 +215,8 @@ BlazeComponent.extendComponent({
         });
       }
 
-      // Disable drag-dropping if the current user is not a board member or is miniscreen
+      // Disable drag-dropping if the current user is not a board member
       $swimlanesDom.sortable('option', 'disabled', !userIsMember());
-      $swimlanesDom.sortable('option', 'disabled', Utils.isMiniScreen());
     });
 
     function userIsMember() {

client/components/cards/minicard.jade

@@ -4,8 +4,8 @@ template(name="minicard")
     class="{{#if isLinkedBoard}}linked-board{{/if}}"
     class="minicard-{{colorClass}}")
     if isMiniScreen
-      //.handle
-      //  .fa.fa-arrows
+      .handle
+        .fa.fa-arrows
     unless isMiniScreen
       if showDesktopDragHandles
         .handle

client/components/lists/list.js

@@ -129,7 +129,7 @@ BlazeComponent.extendComponent({
         showDesktopDragHandles = false;
       }
 
-      if (!Utils.isMiniScreen() && showDesktopDragHandles) {
+      if (Utils.isMiniScreen() || showDesktopDragHandles) {
         $cards.sortable({
           handle: '.handle',
         });
@@ -143,8 +143,8 @@ BlazeComponent.extendComponent({
         $cards.sortable(
           'option',
           'disabled',
-          // Disable drag-dropping when user is not member/is miniscreen
-          !userIsMember() || Utils.isMiniScreen(),
+          // Disable drag-dropping when user is not member
+          !userIsMember(),
           // Not disable drag-dropping while in multi-selection mode
           // MultiSelection.isActive() || !userIsMember(),
         );

client/components/lists/listHeader.jade

@@ -30,10 +30,9 @@ template(name="listHeader")
               if canSeeAddCard
                 a.js-add-card.fa.fa-plus.list-header-plus-icon
               a.fa.fa-navicon.js-open-list-menu
-          //a.list-header-handle.handle.fa.fa-arrows.js-list-handle
         else
           a.list-header-menu-icon.fa.fa-angle-right.js-select-list
-          //a.list-header-handle.handle.fa.fa-arrows.js-list-handle
+          a.list-header-handle.handle.fa.fa-arrows.js-list-handle
       else if currentUser.isBoardMember
         if isWatching
           i.list-header-watch-icon.fa.fa-eye

client/components/swimlanes/swimlanes.js

@@ -111,7 +111,7 @@ function initSortable(boardComponent, $listsDom) {
       showDesktopDragHandles = false;
     }
 
-    if (!Utils.isMiniScreen() && showDesktopDragHandles) {
+    if (Utils.isMiniScreen() || showDesktopDragHandles) {
       $listsDom.sortable({
         handle: '.js-list-handle',
       });
@@ -126,8 +126,8 @@ function initSortable(boardComponent, $listsDom) {
       $listsDom.sortable(
         'option',
         'disabled',
-        // Disable drag-dropping when user is not member/is worker/is miniscreen
-        !userIsMember() || Meteor.user().isWorker() || Utils.isMiniScreen(),
+        // Disable drag-dropping when user is not member/is worker
+        !userIsMember() || Meteor.user().isWorker(),
         // Not disable drag-dropping while in multi-selection mode
         // MultiSelection.isActive() || !userIsMember(),
       );
@@ -188,8 +188,7 @@ BlazeComponent.extendComponent({
           }
 
           const noDragInside = ['a', 'input', 'textarea', 'p'].concat(
-            Utils.isMiniScreen() ||
-              (!Utils.isMiniScreen() && showDesktopDragHandles)
+            Utils.isMiniScreen() || showDesktopDragHandles
               ? ['.js-list-handle', '.js-swimlane-header-handle']
               : ['.js-list-header'],
           );