Merge pull request #7859 from BeksOmega/fix/previewer-disposing

fix: connection previewer disposing too early
(cherry picked from commit da3ec25)

core/block_dragger.ts

@@ -382,7 +382,6 @@ export class BlockDragger implements IBlockDragger {
 
  blockAnimation.disconnectUiStop();
  this.connectionPreviewer.hidePreview();
- this.connectionPreviewer.dispose();
 
  const preventMove =
  !!this.dragTarget_ &&
@@ -417,6 +416,9 @@ export class BlockDragger implements IBlockDragger {
  );
  }
  }
+ // Must dispose after `updateBlockAfterMove_` is called to not break the
+ // dynamic connections plugin.
+ this.connectionPreviewer.dispose();
  this.workspace_.setResizesEnabled(true);
 
  eventUtils.setGroup(false);