Clone the native event to avoid weird issues
Clone the native event to avoid weird issues

See https://stackoverflow.com/questions/53211240/clone-an-instance-of-reacts-synthetic-event for some background

Also avoid code duplication.

hms-dbmi/higlass,hms-dbmi/higlass,hms-dbmi/higlass,hms-dbmi/4DN_matrix-viewer,hms-dbmi/4DN_matrix-viewer,hms-dbmi/higlass,hms-dbmi/4DN_matrix-viewer