bug#69246: 30.0.50; persistent key input delay after using vc commands in pgtk

[Po Lu]

Nick OBrien <nick4f42@proton.me> writes:

> Running "GTK_IM_MODULE=none emacs -Q" and following the steps in the original
> bug report, the lag appears to be fixed. I reproduced it three times, and each
> time there was no lag. For reference, I tried again with GTK_IM_MODULE=fcitx
> (how it was in the original bug report) and 4/4 times I experienced the lag.
>
> I haven't ever experienced this sort of lag in Firefox or signal-desktop, two
> gtk3 apps I regularly use. And just to clarify, the lag doesn't seem to 
> lengthen
> the interval between generated repeat key-presses. The repeated key-presses 
> just
> seem /choppier/, as if the frame-rate is lower. The lag is most obvious when
> holding down a key and releasing after a single key appears.
>
> I'll try using my normal config with GTK_IM_MODULE=none and see if I 
> experience
> the lag in everyday use.

I suppose your problem is that fcitx cannot tolerate programs responding
to keyboard input in a manner unconventional for a GTK program, as Emacs
does.