Comment 16 for bug 1672166

I won't exclude anything at this point, but this seems unlikely, as Onboard doesn't depend on any particular input method.

There is not that much left that can fail. Recording text changes is basically incoming AT-SPI events, AT-SPI method calls and a bit of glue code in Onboard. It's mostly one function, TextContext._record_text_change(). The AT-SPI text-change events may be OK, you can see incoming text in these lines
Onboard.WPEngine context=['<bot:txt>', 'hello', 'hel']

but perhaps one of the AT-SPI calls fails for some reason. I'll add debug output later today.