Fullscreen support for Welcome Sketches (Mouse2D, Flocking, Arctangent)

Most relevant area for this enhancement?

Core/Environment/Rendering

Feature to enhance

The built-in sketches shown in the Processing Welcome screen (e.g. Mouse2D, Flocking, Arctangent).

Desired enhancement

Enhance the example sketches launched from the Processing Welcome screen (such as Mouse2D, Flocking, and Arctangent) so that they scale properly when the user resizes or fullscreen maximizes the IDE window. Currently, these sketches are hardcoded with fixed dimensions and positions, and cannot be extended to fullscreen unlike the welcome sketch RotatingArcs.

Potential benefits

Sketches from the Welcome screen adapt to all screen sizes (especially useful on large displays).

Improves learning experience for new users

Possible drawbacks

Not clear how to persist .pde patches without touching build/resources bundled, which is ignored by Git and overwritten on build.

Might require modifying Welcome.java to point to a new examples folder or setting a user preference to toggle enhanced examples.

Additional context

I've already implemented and tested working versions of these fullscreen-compatible .pde files and stored them in a local folder.
They work perfectly, but am seeking guidance on how to register these sketches with the Welcome screen and ensure they survive project rebuilds.

Would you like to work on the issue?

Yes but need help.

首先检查 Welcome.java 以及随附的 Mouse2D、Flocking、Arctangent 和 RotatingArcs .pde 草图，了解 Welcome 屏幕示例是如何注册和加载的。确定更新后的草图应放在哪里，以便重新构建时保留它们；完成标准是三个草图都能正确调整大小或切换到全屏，并且在重新构建后仍然可用。