DropTargetExtensionConnector blocks the drop if the event.dataTransfer contains a type Files. The purpose of that is to keep the listener from consuming the event if an actual file is dragged onto the drop target, so that the same area can optionally be used as a FileDropTarget too. However, the current check accidentally also blocks Image components, as well as some (but not all) other components that contain an <img> tag, like a Label that has an icon set to the caption (but not a Button with the same icon set).
DropTargetExtensionConnectorblocks the drop if theevent.dataTransfercontains a typeFiles. The purpose of that is to keep the listener from consuming the event if an actual file is dragged onto the drop target, so that the same area can optionally be used as aFileDropTargettoo. However, the current check accidentally also blocksImagecomponents, as well as some (but not all) other components that contain an<img>tag, like aLabelthat has an icon set to the caption (but not aButtonwith the same icon set).See also https://support.vaadin.com/browse/VS-5045 (internal access only)