Cannot filter by more than one label

In pre-7.7 it was possible to select more than one label while filtering issues. In 7.7 there is single select element, so only one label can be selected.

When few labels denote app component (core, ui, module, config, ...) and other tags denote issue type (bug, feature request, documentation), it is very handy to be able to filter by two labels, for example show only bugs in core.

However, pre-7.7 does logical OR when multiple labels are selected, which is not very useful. Please use logical AND here. I think this worked before, but I'm not sure.