Filter results in map alongside with already visible points

When I hit the "show in map" (Zobrazit na mapě) button Locus shows the filter results in the map but hides all the other points that were visible till that moment.

Would it be possible to add an option to show the results alongside with the already visible points? Now to add some points to the already visible ones it's necessary to leave the filter and select the results manually. One button to do that would be very nice.