src/vs/editor/contrib/dnd/browser/dnd.ts/DragAndDropController/onEditorKeyUp
class DragAndDropController:	private onEditorKeyUp(e: IKeyboardEvent): void {
		if (!this._editor.getOption(EditorOption.dragAndDrop) || this._editor.getOption(EditorOption.columnSelection)) {
			return;
		}

		if (hasTriggerModifier(e)) {
			this._modifierPressed = false;
		}

		if (this._mouseDown && e.keyCode === DragAndDropController.TRIGGER_KEY_VALUE) {
			this._editor.updateOptions({
				mouseStyle: 'default'
			});
		}
	}