Add selected cards duplication with CTRL+D

CHANGELOG.md

@@ -21,6 +21,7 @@ This changelog summarizes updates to our open source project. You can also find
   * Add docker-compose to run the whole service in containers. [#105](https://github.com/mattermost/focalboard/pull/105) Thanks @jbutler992!
   * Added Gallery view.
   * Added Checkbox content type.
+  * Added Selected cards duplication with CTRL+D.
 * Requested Contributions
   * Add more frontend unit test coverage. [#126](https://github.com/mattermost/focalboard/pull/126) Thanks @renjithgr!
   * [GH-40](https://github.com/mattermost/focalboard/issues/40) - Add property type email [#84](https://github.com/mattermost/focalboard/pull/84). Thanks @renjithgr!

webapp/src/components/centerPanel.tsx

@@ -55,6 +55,13 @@ class CenterPanel extends React.Component<Props, State> {
             this.deleteSelectedCards()
             e.stopPropagation()
         }
+
+        if ((e.ctrlKey || e.metaKey) && !e.altKey && !e.shiftKey && e.keyCode === 68 && this.state.selectedCardIds.length > 0) {
+            // CTRL+D: Duplicate selected cards
+            this.duplicateSelectedCards()
+            e.stopPropagation()
+            e.preventDefault()
+        }
     }
 
     componentDidMount(): void {
@@ -309,6 +316,26 @@ class CenterPanel extends React.Component<Props, State> {
 
         this.setState({selectedCardIds: []})
     }
+
+    private async duplicateSelectedCards() {
+        const {selectedCardIds} = this.state
+        if (selectedCardIds.length < 1) {
+            return
+        }
+
+        mutator.performAsUndoGroup(async () => {
+            for (const cardId of selectedCardIds) {
+                const card = this.props.boardTree.allCards.find((o) => o.id === cardId)
+                if (card) {
+                    mutator.duplicateCard(cardId)
+                } else {
+                    Utils.assertFailure(`Selected card not found: ${cardId}`)
+                }
+            }
+        })
+
+        this.setState({selectedCardIds: []})
+    }
 }
 
 export default injectIntl(CenterPanel)