I use your app to test WebGL2 graphics via the built-in HTML file viewer. Quite often, after minimizing the app and switching to other apps, the WebGL context gets lost and the canvas stops rendering anything (blank/black). Returning to the app does not restore rendering.

Expected behavior

After returning to the app, WebGL2 rendering should recover correctly (or the viewer should automatically restart the renderer) without requiring a full app restart.

Actual behavior

The context is lost and rendering never comes back. The only workaround is fully restarting the app.

Why this matters

A full restart resets the code editing history/undo-redo, so I lose recent edits. This is very disruptive.

Steps to reproduce

1. Open the attached HTML file (WebGL2 canvas) in the built-in HTML viewer.
2. Minimize the app.
3. Open other apps until this app goes into the background and is effectively “suspended”.
4. Return to the app.
5. The canvas shows nothing and rendering does not recover.

Reproducibility

High. It happens frequently for me; with the attached HTML it’s almost 100% reproducible once the app is suspended in the background.

Environment

• Device: iPhone 13 mini
• OS: iOS 17.6
• Mode: built-in HTML viewer
• WebGL: WebGL2

Attachments

• repro.html

  (minimal reproduction)

Additional notes

This looks like a context loss on backgrounding. It may help to handle webglcontextlost / webglcontextrestored and/or recreate the context/resources when the app returns to the foreground, so the viewer can recover without requiring an app restart.

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