Add "Move Lines" Feature to p5.js Web Editor

Increasing Access

This feature enhances accessibility and usability by allowing users to move lines up or down using a shortcut, similar to modern code editors (eg., IntelliJ, VSCode and Processing 4) . It streamlines the editing experience, making it easier for users—especially beginners and those using keyboards for navigation—to organize their code efficiently.

Feature request details

I previously implemented this feature in the Processing 4 repository (PR #964), where it was approved. I'd like to port same functionality to the p5.js Web Editor to ensure consistency across Processing-related projects and improve the user experience.

Additionally, if this feature is added, I’d be happy to contribute documentation to ensure users can easily discover and use it.

I'm also interested in contributing to the p5.js Web Editor for Google Summer of Code 2025, and this would be a great opportunity to get familiar with the codebase while making meaningful improvements. Looking forward to feedback!

Start by locating the p5.js Web Editor's code editor and keyboard-shortcut handling, then compare the intended behavior with Processing 4 PR #964. The work is done when users can move selected lines up or down with a shortcut and the behavior is documented for discovery.