Tag filter is of the (A OR B) type only and it should include a (A AND B) type of filter

[Felipe Vieira]

The semantics of "any" in the "having any of these" (see image) limits the power of tags. The menu should also have a (A AND B) option.

The lack of that type of filter penalizes the following behavior:

*   Set tags consistently across card-sets.

*   Be disciplined with tags.

Example: a person studies language A and B, on both vocabulary and grammar levels. There's no way of filtering:

```
is_language_a AND is_grammar
```

And this combination of tags make a lot of sense.

I can help with the implementation, but I could use some pointers in the codebase.

[Peter Bienstman]

If you want to extend the filter options, I think also the GUI should be carefully considered. Mnemosyne is originally targeted for non-computer savvy people who don't know about logical operators, hence the current verbose wording.

The way to go would probably be a plugin which allows more flexible boolean operators for power users, leaving the default behaviour intact. Or switch to Anki :-) 

Apart from basic maintenance, I'm no longer working on Mnemosyne, but the current filter implementation is in pyqt_ui/card_browser.py.

Cheers, 

Peter 

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