ctrl+ok keeps window open for filter selection

[sparr]

TL;DR

When adding filters to a combinator, logistics requests, etc, hold CTRL while clicking OK and the dialog will stay open to select another after adding the current selection.

What ?

Various interfaces allow you to select multiple items or signals, such as the constant combinator, logistics request slots, and infinity filters. Adding multiple items here requires a lot of repetitive clicking. I suggest allowing the user to hold CTRL when they submit a selection (click OK, press Enter, double click a item) so the item will get added to the list but the dialog will stay open to select another item for the next filter slot.

Why ?

This would approximately cut in half the time it takes me to set up these things with a bunch of signals. Maybe a different ratio for other people, but still a lot of unnecessary clicks saved.