fix: handle extra scenario where the prompt is sent with trailing spaces

[231tr0n]

Handle extra prompt scenario where the prompt has trailing spaces leading to unwanted behaviour.

Context

The way trim_prompt works is that if the last character is ":" it trims it. But the issue is there are plugins like nvim-dap which send prompts like this "Configurations: " with an extra trailing space leading to the addition of extra space by my last pr for fzf backend https://github.com/stevearc/dressing.nvim/pull/136 to add an unwanted extra space. This pr fixes that behaviour.

Behaviour withou this pr

Behaviour with this pr

Description

It changes the prompts functionality by removing trailing spaces from prompts.

Test Plan

bootstrap_paq({
    {
        "junegunn/fzf",
        build = ":call fzf#install()",
    },
    "junegunn/fzf.vim",
    "stevearc/dressing.nvim",
    "mfussenegger/nvim-dap",
        {
        "microsoft/vscode-js-debug",
        build = function()
            local path = vim.fn.stdpath("data") .. "/site/pack/paqs/start/vscode-js-debug"
            vim.fn.system({
                "bash",
                "-c",
                "cd " .. path .. " && rm -rf dist out && npm install && npx gulp vsDebugServerBundle && mv dist out",
            })
            return true
        end,
    },
    "mxsdev/nvim-dap-vscode-js",
})

require("dap-vscode-js").setup({
    debugger_path = vim.fn.stdpath("data") .. "/site/pack/paqs/start/vscode-js-debug",
    adapters = { "pwa-node" },
})
for _, language in ipairs({ "typescript", "javascript" }) do
    require("dap").configurations[language] = {
        {
            type = "pwa-node",
            request = "launch",
            name = "Launch file",
            program = "${file}",
            cwd = "${workspaceFolder}",
        },
        {
            type = "pwa-node",
            request = "attach",
            name = "Attach",
            processId = require("dap.utils").pick_process,
            cwd = "${workspaceFolder}",
        },
    }
end

require("dressing").setup({
    select = {
        backend = { "fzf", "nui", "builtin" },
        trim_prompt = false,
    },
})

You can start a debug session to see the above difference.

:lua require('dap').continue()