[adrian-andrzjewski]

Fixes #1219

Summary

• Preserve application-controlled cursor visibility when a disabled FlyByCamera is registered.
• Keep existing cursor behavior when a registered camera is toggled on or off.

Validation

• Confirmed the regression test fails before the fix because registration makes the cursor visible.
• ./gradlew.bat :jme3-core:test --no-daemon --console=plain (passed).

[jaime-jmebot]

Hi, thanks for taking this on. The change is nicely focused: registering a disabled FlyByCamera no longer overrides cursor visibility that the application has already set, while the enabled registration path still installs the mappings and retains the existing visibility behavior.

I also checked the regression test against the relevant enable/disable flow. It verifies both that registration preserves a hidden cursor when the controller is disabled and that toggling the registered controller still restores the cursor when disabling it. That gives good coverage of the original regression without changing the established toggle behavior.

Looks good to me—thanks for adding the regression test alongside the fix!