Describe the bug
When exporting annotation with Flashcard, the JSON line is undefined

    },
    undefined,
    {

To Reproduce
Steps to reproduce the behavior:

1. Annotate a line of text
2. Add a Flashcard with data on back and front
3. Export annotation as JSON
4. Search "undefined" you should get to that badly exported entry

Expected behavior

Fla

When I start Anki 2.0, "Your Incremental Reading settings file has been modified for compatibility reasons. …", and my custom QuickKey is not there when I start Anki 2.1 after that.

Pre-requisites:

• There are several words in lookup history

Steps to reproduce:

1. Open lookup history
2. Rate a word (do not refresh the page after it)
3. Sort the table by the rate column

Expected result
Words are sorted correctly based on the selected sorting configuration.

Actual result
Words are sorted incorrectly. See the attachment demonstrating the behavior.

We currently overwrite CollectionStats.todayStats in order to allow users to define a custom maturity ivl. This can cause conflicts with other add-ons that patch the same method.

We should investigate if this approach is actually still necessary. For starters, we should look into conditionally overwriting CollectionStats.todayStats only if a non-defaut MATURE_IVL is set.

(Thanks to Gus