How to set ":" as a word char?

[gaoqiangks]

aabb.mp4

My main issue is when editing a LaTeX document. I have an equation labeled eq:lp:inequality. When I trigger autocompletion by typing \ref{eq, blink.cmp works as expected. However, when I press :, the completion list disappears. I think blink.cmp does not treat : as a word character. I have looked up some materials but haven’t found where to configure this. The completion source here is vimtex, and I believe its configuration is correct, because when I switch from blink.cmp to nvim-cmp, everything works as intended. Below is my blink configuration.

return {
    {
        "saghen/blink.cmp",
        -- enabled = false,
        dependencies = {
            "L3MON4D3/LuaSnip",
            "saghen/blink.compat", -- 必须，用于兼容你的自定义 cmp 源
            "zbirenbaum/copilot.lua",
            "kawre/neotab.nvim",
            -- 保持你原有的源，但现在通过 blink.compat 调用
            { url = "git@github.com:gaoqiangks/cmp-dictionary.git" },
            { url = "git@github.com:gaoqiangks/cmp-vimtex.git" },
        },
        version = "*", -- 使用最新稳定版

        ---@module 'blink.cmp'
        ---@type blink.cmp.Config
        config = function()
            local opts = {
                -- 1. 基础热键配置
                keymap = {
                    ["<CR>"] = { "accept", "fallback" },
                    ["<Up>"] = { "select_prev", "fallback" },
                    ["<Down>"] = { "select_next", "fallback" },
                    ["<C-p>"] = { "select_prev", "fallback" },
                    ["<C-n>"] = { "select_next", "fallback" },
                    ["<C-b>"] = { "scroll_documentation_up", "fallback" },
                    ["<C-f>"] = { "scroll_documentation_down", "fallback" },

                    -- 还原你的 Alt 系列映射
                    ["<A-n>"] = { "select_next", "fallback" },
                    ["<A-p>"] = { "select_prev", "fallback" },
                    ["<A-e>"] = {
                        function()
                            if require("copilot.suggestion").is_visible() then
                                require("copilot.suggestion").accept()
                            else
                                require("neotab").tabout()
                            end
                        end,
                        "fallback",
                    },
                    ["<A-w>"] = {
                        function()
                            if require("copilot.suggestion").is_visible() then
                                require("copilot.suggestion").accept_word()
                            else
                                require("neotab").tabout()
                            end
                        end,
                    },
                    ["<A-h>"] = {
                        function()
                            require("luasnip").jump(-1)
                        end,
                        "fallback",
                    },
                },

                -- 2. 外观与图标 (还原你的 kind_icons)
                appearance = {
                    use_nvim_cmp_as_default = true,
                },

                -- 3. 补全源配置
                sources = {
                    default = { "lsp", "path", "snippets", "buffer", "dictionary", "vimtex" },
                    -- 核心过滤逻辑：跨源过滤
                    ---@param items blink.cmp.CompletionItem[]
                    providers = {
                        -- 使用 compat 包装你的自定义源
                        dictionary = {
                            name = "dictionary",
                            module = "blink.compat.source",
                            score_offset = 20, -- 给词典稍微高一点的权重
                        },
                        vimtex = {
                            name = "vimtex",
                            -- min_keyword_length = 2,
                            module = "blink.compat.source",
                            score_offset = 80,
                        },
                        snippets = {
                            name = "snippets",
                            -- 使用 luasnip 引擎
                            score_offset = 10,
                            opts = {
                                search_paths = { vim.fn.stdpath("config") .. "/snippets" },
                            },
                        },
                    },
                },

                -- 4. 排序逻辑 (关键：还原你的 frequency_compare)
                -- Blink 使用分值系统，我们可以通过 transform_items 来调整分值
                signature = { enabled = true },
                completion = {
                    list = { selection = { preselect = true, auto_insert = true } },
                    menu = { border = "rounded" },
                    documentation = { window = { border = "rounded" }, auto_show = true },
                    trigger = {
                        -- 默认开启关键词触发
                        show_on_keyword = true,
                        -- 核心设置：输入至少 3 个字符才显示补全
                        min_keyword_length = 3,
                        keyword_regex = "[%w_%-:@]",
                    },
                },
                snippets = { preset = "luasnip" },
            }
            require("blink.cmp").setup(opts)
        end,
    },
}