Dropped keyboard input

[timadye]

I still have the problems with occasionally dropped keys that I reported last year in #724. Since then I have upgraded FluentTerminal (now 0.7.5.0) and Windows 1909.

What seems to happen is that a key I press is not passed to the user shell (bash, ssh, WSL). Sometimes just one byte of a multi-byte key is lost (eg. Up (ESC+[A) becomes the literal text "[A". The nasty behaviour comes and goes, so sometimes it is frequent, other times rare. Maybe it's dependent on the load on the machine or (Sophos) AV activity, but I haven't observed a clear correlation. Unfortunately when the problem strikes, it can make FluentTerminal almost unusable.

I don't see the same problem with Microsoft Terminal, MinTTY, or mrxvt+X11 (though each of those has its own deficiencies, which is why I'd like to move to FluentTerminal).

I have seen the problem running Cygwin (bash and ssh) and WSL bash in FluentTerminal tabs. I haven't seen it with CMD or Powershell or FluentTerminal's SSH, but that may just be because I don't use them enough for the problem to strike.

I tried with and without ConPty and also with and without the CYGWIN=disable_pcon settings. Since the problem is intermittent, it's difficult to draw firm conclusions on every combination (ConPty general setting, ConPty profile setting, disable_pcon for bash/ssh/WSL), so if you have any ideas of what options are most useful to test I can try to make a better test.

Is anyone else still seeing this, or is it now just me? Do you have any ideas for how I can help track it down - or even better a fix?

Thanks, Tim.