cannot select candidate from the panel

[Shannon]

It happened twice, however, I didn't notice how to reproduce it. The problem happened suddenly (this time) when I am editing a commit message in VSCode.

PROBLEM:

See the attached ime.gif demo. When I type some pinyin the corresponding Chinese character is shown on the panel, I select any number, say "3", the character "重" should be selected and appear in the text area. However, the number 3 is entered. And after that the IME does not work anymore, until I switch back to English, then To Chinese again, from the system tray. Anyway, when this bug happens, I can only enter the first candidate of any pinyin (by hit space), but cannot select others by using numbers.

REASON:

I found that by deleting the folder ~/.cache/ibus and login again, this problem is gone. Further investigation show that problematic files are one (or more) of the following:

xrfang@office:~/.cache/ibus/libpinyin$ ls user*
user_bigram.db user.conf user_pinyin_index.bin
user.bin user_phrase_index.bin

GUESS:

I am definitely sure that this is a bug, because it happened twice. I feel that I might inadvertently triggered some key combination so as to ruined one of the above files. And IBUS crashed when trying to load them.

Since it might be hard to identify how these files are corrupted, and as they are cache only, I would suggest the IBUS author(s) investigate how to prevent crash when loading corrupted cache files.