Fix move card last selection is gone.

Thanks to mimZD and xet7 !

Fixes #6046

client/components/cards/cardDetails.jade

@@ -843,7 +843,7 @@ template(name="copyAndMoveCard")
   label {{_ 'cards'}}:
   select.js-select-cards
     each cards
-      option(value="{{_id}}") {{add @index 1}}. {{title}}
+      option(value="{{_id}}" selected="{{#if isDialogOptionCardId _id}}selected{{/if}}") {{add @index 1}}. {{title}}
 
   div
     input(type="radio" name="position" value="above" checked id="position-above" style="display: inline")

client/lib/dialogWithBoardSwimlaneListCard.js

@@ -12,6 +12,23 @@ export class DialogWithBoardSwimlaneListCard extends DialogWithBoardSwimlaneList
     return ret;
   }
 
+  onCreated() {
+    super.onCreated();
+    this.selectedCardId = new ReactiveVar('');
+  }
+
+  /** set the last confirmed dialog field values
+   * @param boardId the current board id
+   */
+  setOption(boardId) {
+    super.setOption(boardId);
+    
+    // Also set cardId if available
+    if (this.cardOption && this.cardOption.cardId) {
+      this.selectedCardId.set(this.cardOption.cardId);
+    }
+  }
+
   /** returns if the card id was the last confirmed one
    * @param cardId check this card id
    * @return if the card id was the last confirmed one
@@ -21,14 +38,28 @@ export class DialogWithBoardSwimlaneListCard extends DialogWithBoardSwimlaneList
     return ret;
   }
 
-  /** returns all available cards of the current list */
-  cards() {
-    const list = ReactiveCache.getList(this.selectedListId.get());
-    let ret = [];
-    if (list) {
-      ret = list.cards(this.selectedSwimlaneId.get());
-    }
-    return ret;
+  /** get the board data from the server
+   * @param boardId get the board data of this board id
+   */
+  getBoardData(boardId) {
+    const self = this;
+    Meteor.subscribe('board', boardId, false, {
+      onReady() {
+        const sameBoardId = self.selectedBoardId.get() == boardId;
+        self.selectedBoardId.set(boardId);
+
+        if (!sameBoardId) {
+          // reset swimlane id
+          self.setFirstSwimlaneId();
+
+          // reset list id
+          self.setFirstListId();
+          
+          // reset card id
+          self.selectedCardId.set('');
+        }
+      },
+    });
   }
 
   events() {
@@ -65,6 +96,8 @@ export class DialogWithBoardSwimlaneListCard extends DialogWithBoardSwimlaneList
         },
         'change .js-select-lists'(event) {
           this.selectedListId.set($(event.currentTarget).val());
+          // Reset card selection when list changes
+          this.selectedCardId.set('');
         },
       },
     ];