Johny.: @MarkoH01 I don't know about that. I guess that question would apply to all filters in library and in catalog. Now it's like
( Filter1_A OR Filter1_B OR Filter1_C ) AND ( Filter2_B OR Filter2_D ) Which is I guess most correct way for this user interface.
To customize more it would require a little more advanced filter creation interface than just selecting checkboxes. :)
I understand this for the usual GOG filters (Language, OS, Publisher...) but wouldn't it be possible to use the logical AND just in the user defined tags? Or give us the choice in the "manage tags" section in which way these should be handled.
Edit: Addition: I tried to use the GOG genre filter instead of my own tag as a workaround and I noticed that I am unable to select all games in my library even if I check all genre filters on GOG. This would mean that a filter option fo a genre (opr some genres) is missing. Since I am unable to filter games which are NOT of a criteria I have not found out yet which games/genres these are.
Edit2: Using MaGog with the exact genre filters GOG is providing it is possible to select all my games so something is wrong on GOG's side I would say. While MaGog is able to select 239/245 (the difference is probably due to the unbundling) GOG's filter is only able to select 224/245.