[BUG] 多行errorfmt 不显示匹配的错误信息

[MaiLunJiye]

非常喜欢这个插件的errorfmt功能，但是在处理多行errorfmt时候会出现匹配的错误信息在quickfix窗口消失问题。

复现步骤

配置：

    {
        'skywind3000/asynctasks.vim',
        dependencies = {
            'skywind3000/asyncrun.vim',
            'nvim-telescope/telescope.nvim',
            'GustavoKatel/telescope-asynctasks.nvim',
            'voldikss/vim-floaterm',
        },
        init = function()
            vim.g.asynctasks_extra_config = {'~/.config/nvim/tasks.ini'}
            vim.g.asyncrun_open = 6
        end
    },

测试文件 test_output

ERROR: space prohibited before open square bracket '['
#62: FILE: net/ipv4/tcp.c:4231:
+       init_net.ipv4.sysctl_tcp_rmem [0] =SK_MEM_QUANTUM;

ERROR: spaces required around that '=' (ctx:WxV)
#62: FILE: net/ipv4/tcp.c:4231:
+       init_net.ipv4.sysctl_tcp_rmem [0] =SK_MEM_QUANTUM;
                                          ^

ERROR: space prohibited before open square bracket '['
#63: FILE: net/ipv4/tcp.c:4232:
+       init_net.ipv4.sysctl_tcp_rmem [1] =131072;

ERROR: spaces required around that '=' (ctx:WxV)
#63: FILE: net/ipv4/tcp.c:4232:
+       init_net.ipv4.sysctl_tcp_rmem [1] =131072;
                                          ^

ERROR: space prohibited before open square bracket '['
#64: FILE: net/ipv4/tcp.c:4233:
+       init_net.ipv4.sysctl_tcp_rmem [2] =max(131072, max_rshare);

ERROR: spaces required around that '=' (ctx:WxV)
#64: FILE: net/ipv4/tcp.c:4233:
+       init_net.ipv4.sysctl_tcp_rmem [2] =max(131072, max_rshare);
                                          ^

total: 6 errors, 0 warnings, 0 checks, 50 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

测试 task.ini

[test]
command=cat ./test_output.txt
cwd=$(VIM_ROOT)
output=quickfix
errorformat=%Z%p^,%C+%.%#,%C#%n: FILE: %f:%l:,%EERROR:\ %m
save=1

执行结果：

可以发现，所有efm匹配的错误日志行都消失了。

除非再次输入 :copen 才能达到预期效果：

[skywind3000]

加个 once 即可，让输出在程序结束时一次性写入 quickfix 而不是实时分批写入：

[test]
command=cat ./test_output.txt
cwd=$(VIM_ROOT)
output=quickfix
errorformat=%Z%p^,%C+%.%#,%C#%n: FILE: %f:%l:,%EERROR:\ %m
save=1
once=1

详细见：https://github.com/skywind3000/asynctasks.vim/wiki/Task-Config