Deduplicating key presses when emulating

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Is there an existing issue for this?

• I have searched the existing open and closed issues

Does the issue happen when logged in?

Yes

Does the issue happen when logged out?

Yes

Does the issue happen in incognito mode when logged in?

Yes

Does the issue happen in incognito mode when logged out?

Yes

Account name

informthemusic

Account config

No response

Current Behavior

Some letters are duplicated - only when emulating layout. The issue never happens outside of layout emulation.

Expected Behavior

Keys should not deduplicate.

Steps To Reproduce

Let [LAYOUT] a layout you can type with

1. Emulate [LAYOUT] (regardless of if it already is your current layout)
2. Run a few tests, possibly notice some keys deduplicating
3. Un-emulate
4. Notice that the keys no longer deduplicate

Environment

• OS: NixOS (Linux 6.12.93 #1-NixOS SMP PREEMPT_DYNAMIC Tue Jun 9 10:26:06 UTC 2026 x86_64 GNU/Linux)
• Browser: Firefox
• Browser Version: Gecko/20100101 Firefox/152.0

Anything else?

No response

Start by reproducing the issue in Firefox with layout emulation enabled, then trace the layout-emulation and keyboard-event handling paths in the TypeScript codebase. Done means letters are no longer duplicated while emulating a layout, and typing remains unchanged after emulation is disabled.