Looks fine in light mode, text unreadable in dark mode.

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

Affects versions :

• OS: Linux (Arch)
• Desktop environment: X11
• Xournal++ 1.1.0+dev
• libgtk: 3.24.29
• Installation method: AUR - xournalpp-git

Describe the bug
I am using a plugin to change sizes of tools, but the size of cursor indicator
changes only after changing the color or after switching to another tool and
back.

To Reproduce
Create a simple plugin,

Describe the solution you'd like
The private API should provide a way to delete all revisions of a note

Additional context
This implements an aspect of documentation merged in hedgedoc/hedgedoc#1033