Input chars messed up with Fcitx
Fcitx 4.2.8.3, Firefox ESR 52.7.3, 32bit Linux. Due to customized extensions, I have not upgrade to ESR 60.
I used to use ESR 38 with Gtk2. Everything was fine. Now with ESR52 with Gtk3, if I input too fast, the chars shown in Firefox got messed up, like missing, or wrong order. I have tested YAD with Gtk3, worked fine. Rxvt is still working, YAD with Gtk2 is still working.
The problem does not depend on Fcitx status. Chinese, English, Japanese, as long as the process is there, the issue is there.
I have no idea where to check. Please give a hint or clue. Thanks.