[web] "ctrl-alt" and "shift-ctrl-alt" layers on longpress keys do not output the expected on Android 10 device

[MakaraSok]

Describe the bug
Longpress keys with references to "ctrl-alt" and "shift-ctrl-alt" do not produce the expected output on Anndroid 10. The output could be a beep or an unexpected character.

To Reproduce
Steps to reproduce the behavior:

1. Download this keyboard
2. Add it to Keyman for Android on Android 10 Emulator
3. Go to Numeric layer and then longpress on [ and then pick {.
4. See error, a beep was output instead of {.

You can also try other longpress on Numeric layer to see similar behavior.

Expected behavior
When given correct references on longpress keys to the existing key sequences (i.e. ctrl-alt and shift-ctrl-alt), the longpress keys should output the character being referred to.

---

(Delete the irrelevant sections)

Android:

• Device: Pixel 2
• OS: Android 10
• Keyman version: 13.0.6218
• Target application: Keyman for Android

Keyman Developer:

• OS: Windows 10 1909
• Keyman Developer version: 13.0.111

---

Keyboard
https://community.software.sil.org/t/longpress-key-gives-invalid-key-beep-on-phones-but-works-correctly-on-test-keyboard-on-web/3823/3?u=makara

Additional context
A work around: changing the key Modifier to "current layer" and Code to "K_4" for the longpress key fix the issue for now.

This issue may occur on iOS as well, but I do not have a device to test.

[darcywong00]

Upon investigation, this defect has existed in KMW kmwembedded.ts since at least stable-10.0. That's why the keyboards still work in mobile viewport of KMW.

var t=keyName.split('-') fails to account for layers that contain - (e.g. ctrl-alt or shift-ctrl-alt-shift).

Only affects Keyman for Android.
Keyman for iPhone and iPad disconnected this path in #2968 for a separate issue.