Feat/true retention stats

[L-M-Sherlock]

Related issue:

• Integration of the Helper add-on stats #3147

Preview:

[dae]

• If this is not expected to change soon, perhaps we should be making it translatable from the start?
• The summary at the bottom is a bit long. Could we move it to the top, and make it simpler? E.g. 'Pass rate of cards with an interval >= 1 day'?

[dae]

Also, the green text doesn't fit so well with the rest of Anki's interface. Maybe standard black would be a better fit, with perhaps some bolding on key elements?

[L-M-Sherlock]

• If this is not expected to change soon, perhaps we should be making it translatable from the start?

Good point! I will make it translatable later.

• The summary at the bottom is a bit long. Could we move it to the top, and make it simpler? E.g. 'Pass rate of cards with an interval >= 1 day'?

The summary is written by @user1823 in open-spaced-repetition/fsrs4anki-helper#200. I'd like to ask for his opinion.

Also, the green text doesn't fit so well with the rest of Anki's interface. Maybe standard black would be a better fit, with perhaps some bolding on key elements?

OK.

[user1823]

'Pass rate of cards with an interval >= 1 day'?

Looks good.

[L-M-Sherlock]

[Expertium]

"7 days ago" and "30 days ago" implies that it's retention for ONE specific day. "Last week" and "Last month" is better. "Last year" would be nice, though this is already a ton of numbers.

[L-M-Sherlock]

OK

I also removed the Card Counts part because it's confusing and irrelevant to true retention.

[Expertium]

Will you add these as well?

I really hope so, I like knowledge acquisition rate, and I think a lot of people will like it too

[L-M-Sherlock]

I really hope so, I like knowledge acquisition rate, and I think a lot of people will like it too

The stats has included some of them:

[Expertium]

Some, yes, but not all

[L-M-Sherlock]

Fine. I added the Estimated total knowledge (cards):

Daily load and retention by notes require more works to do, so I will consider it in another PR.

[Expertium]

I think these stats need their own dedicated section, with explanations copied from the add-on.
I mean:

1. Estimated total knowledge
2. Knowledge acquisiton rate
3. Daily load

[dae]

Thanks Jarrett.

Some minor issues I noticed that I won't block on:

• collecting the results into a hashmap first is not the most efficient, but it doesn't really matter in this case
• total knowledge is probably more useful as an integer
• in some cases, the start of the table is cut off as the graphs window is resized

[dae]

(further changes welcome in follow-up PRs)