Pressing Alt+any key closes app when using NetDriver

[YourRobotOverlord]

Describe the bug
Pressing Alt+any key closes app when using NetDriver in v2_release

To Reproduce
Steps to reproduce the behavior:

1. Go to UICatalog directory
2. dotnet run --driver NetDriver
3. Press Alt+F
4. UICatalog immediately exits

Expected behavior
The 'File' menu should open

Desktop (please complete the following information):

• OS: Windows 11
• Windows Terminal/Powershell

[tznind]

Looks like terminal sends Esc,F:

2025-02-20 07:52:15.193 +00:00 [VRB] AnsiResponseParser releasing '<esc>'
2025-02-20 07:52:15.193 +00:00 [VRB] AnsiResponseParser releasing 'f'
2025-02-20 07:52:15.200 +00:00 [VRB] InputProcessor raised Esc
2025-02-20 07:52:15.206 +00:00 [VRB] InputProcessor raised f
2025-02-20 07:52:15.211 +00:00 [VRB] MenuBar triggered redraw (NeedsDraw=True NeedsLayout=False) 
2025-02-20 07:52:15.234 +00:00 [INF] RequestStop 'UICatalogTopLevel(1){X=0,Y=0,Width=120,Height=30}'
2025-02-20 07:52:15.271 +00:00 [INF] Input loop exited cleanly

Terminal Sends Escape Sequences

Many terminal emulators translate Alt + Key as Esc followed by Key.
This is a legacy behavior from older Unix systems where the Meta key (Alt) was represented using an Escape (Esc) prefix.

Should be pretty easy fix in #3837 , more complicated in NetDriver/NetEvents (which v2 should replace at some point).

[tznind]

Ok its actually slightly more complex because we have to distinguish between SS3 patterns and Alt patterns. For example.

EscOP - F1
EscO -  Alt + Upper case O

But AnsiParser is currently set up to assume input stream is deterministic - i.e. it has minimal timing awareness. So if we see EscO we cannot just release it as Alt - we need to wait and see if P follows in which case its F1.

There is some timing already built in with InputProcessor, for example here:

private IEnumerable<T> ReleaseParserHeldKeysIfStale ()
{
    if (Parser.State == AnsiResponseParserState.ExpectingEscapeSequence && DateTime.Now - Parser.StateChangedAt > _escTimeout)
    {
        return Parser.Release ().Select (o => o.Item2);
    }

    return [];
}

I think it should be possible to tap in at the release stage and do the Alt processing here.

[tznind]

I have fixed in #3837 for the v2 driver, please try running v2net driver on that branch.

works for single keypress and held down

Keys scenario with v2 net driver