Fcitx Causes LibreOffice Hang Under Certain Circumstances

[suokunlong]

I firstly reported this issue in the LibreOffice bugzilla, but after some investigation I found that this is related to fcitx, thus may be a bug of fcitx. Please help to investigate and fix.

Steps to Reproduce:

1. Enable fcitx .
2. Create a new LibreOffice Calc document, with the following content in column A:

test
1
11

3. Set auto-filter to this column; select cell A2 and freeze the rows/columns (View - Freeze Cells - Freeze Rows and Columns).
4. In the auto-filter dropdown list (in cell A1), select only the item "1", then click OK.

Current Behaviour:
LibreOffice hangs.

There is no hang when disable fcitx.

See also :https://bugs.documentfoundation.org/show_bug.cgi?id=112998. A gdb backtrace is attached within the original bug report.

LibreOffice Version：5.4.3.2 (also reproducible in the most recent master)
Build ID：92a7159f7e4af62137622921e809f8546db437e5
CPU 线程：4; 操作系统：Linux 4.13; UI 渲染：GL; VCL: gtk2;

Reproducible on both Ubuntu 17.10 and Fedora 26 amd64.
区域语言：zh-CN (zh_CN.UTF-8); Calc: single

[wengxt]

Fcitx and IBus have been using such implementation for long time. I don't think the bug can be resolved on our side. I also noticed that the memory increases really fast. My guess is libreoffice has some reentrant function problem.

Especially, Qt version of libreoffice won't trigger this problem.

[ping-wu]

我在 ibus-libpinyin 下，没有问题?

system: Fedora 26, fully updated.

[wengxt]

@ping-wu 你需要一个使用 surrounding text feature 的输入法，比如 ibus-hangul