Mobile VirtualKeyboard issues on Firefox

On Android Firefox trying to type in Terminal and Monaco Editor.

Using DustinBrett.com on Android Firefox Beta 130.0b9:

• 1.1 ok: Typing testing into Terminal types testing.
• 1.2 ok: Typing testing\n into Terminal types testing\n.
• 2.1 er: Typing testing into Monaco Editor types esting.
• 2.2 er: Typing testing\n into Monaco Editor types wrong then eventually types testing\n.
• 3.1 er: Typing tes then clicking testing from keyboard suggestion then typing \b\b (backspaces) into Terminal types testintesti.
• 3.2 er: Typing tes then clicking testing from keyboard suggestion then typing \b\b\n (backspaces) into Terminal types testin.

Using DustinBrett.com on Android Tor (Android Firefox ESR) 115.2.1:

• 1.1 er: Typing testing into Terminal types t.
• 1.2 er: Typing testing\n into Terminal types ttesting\n.
• 2.1 er: Typing testing into Monaco Editor types esting.
• 2.2 er: Typing testing\n into Monaco Editor types wrong then eventually types testing\n.
• 3.1 er: Typing tes then clicking testing from keyboard suggestion then typing \b\b (backspaces) into Terminal types ttestingtesti.
• 3.2 er: Typing tes then clicking testing from keyboard suggestion then typing \b\b\n (backspaces) into Terminal types ttesting.

This is probably related to browser CompositionEvent events not being properly handled or are not consistent across browsers.

See: https://developer.mozilla.org/en-US/docs/Web/API/Element/compositionstart_event

Start by reproducing the listed typing, suggestion, and backspace cases in the Terminal and Monaco Editor on Android Firefox, then compare the browser CompositionEvent behavior described in the MDN reference. Done means the reported inputs produce the expected text consistently in Firefox Beta and Android Tor.