Two-finger double-tap gesture for Undo

[Babibo-dot]

Motivation

Undo currently requires pressing the toolbar button, which slows down the note-taking flow when using a stylus.
A quick gesture would make corrections much faster and more natural.

Solution

Add a gesture where double-tapping with two fingers performs an Undo.
This gesture is common in other note-taking apps and improves usability without changing the UI.

Alternatives

The only alternative is tapping the Undo button on the top toolbar, but it interrupts the writing flow.
No gesture-based alternative currently exists in Saber.

Saber version

v1.29.0 (F-Droid)

Device

• Device: Xiomi Pad 7
• OS: Android 16

Anything else?

Thanks a lot for your work on Saber — it’s already an excellent app!

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