[Bug] JavaScript touch scrolling does not work on Android or iOS

[jsfan3]

Summary

I cannot scroll the JavaScript app at all on Android or iOS, even with a simple form containing just the generated Hello World controls and one long SpanLabel. The content does not move at all when I swipe. I get the same result in Chrome and Edge on Android, and Safari and Chrome on iOS.

On mobile, the hamburger menu and the "Hello World" button also often do not respond when I tap them, or respond only after a long delay.

Minimal reproducer

Test URL: https://routinote.hopto.me/scrolling-test-mobile/.

I generated the project with the web Initializr and added only one long SpanLabel to the generated Hello World screen. I compiled the JavaScript port using the Codename One cloud build server, not an offline build. The full entry-class source is included in #5910.

The test above uses that same cloud output with only a viewport meta tag added to index.html, addressing the omission reported in #5909. The original output is also available at https://routinote.hopto.me/scrolling-test/.

Steps to reproduce

1. Open https://routinote.hopto.me/scrolling-test-mobile/ on a phone.
2. Wait for the Hi World form and long text to appear.
3. Swipe vertically over the text to reach the content below the visible area.
4. The content does not move. The same failure occurs in all four browsers listed below.

Expected and observed behavior

Expected: vertical touch gestures scroll the form's content so that all of the long SpanLabel can be read.

Observed: scrolling is completely blocked on mobile, even with this minimal layout and with the viewport declaration present. The complete lack of scrolling appears to be limited to mobile devices.

Additional desktop observation: scrolling remains possible on desktop, but with more complex layouts it becomes very slow and feels unnatural. I noticed this a few days ago in another project that I have since deleted. I also see it in the Codename One Dashboard: scrolling the list of builds is very slow and unnatural.

Codename One version

7.0.273 (the minimal Initializr project's core and Maven plugin).

JDK version

Microsoft OpenJDK 17.0.19.

Target environment

JavaScript port on physical mobile devices:

Platform	Browser	Result
Android	Chrome	No scrolling at all
Android	Microsoft Edge	No scrolling at all
iOS	Safari	No scrolling at all
iOS	Chrome	No scrolling at all

Build submission host: macOS 15.8.

Last known working version

Unknown.

Logs and diagnostics

The mobile test already includes:

<meta name="viewport" content="width=device-width, initial-scale=1.0">

JavaScript and CSS are unchanged from the cloud output.

Screenshots or recordings

No recording attached; the live minimal example is linked above.

Report checks

• I searched existing issues and discussions for this behavior.
• The reproducer contains no credentials, signing keys, or private customer data.
• I understand that triage is not a commitment to a fix date.