Lens flicker on file write

[MunifTanjim]

• nvim --version:
• Operating system/version:

Describe the bug
A clear and concise description of what the bug is.

To Reproduce using nvim -u mini.lua

Example:
cat mini.lua

-- packer
use {'kevinhwang91/nvim-hlslens'}

require('hlslens').setup()

local kopts = {noremap = true, silent = true}

vim.api.nvim_set_keymap('n', 'n',
    [[<Cmd>execute('normal! ' . v:count1 . 'n')<CR><Cmd>lua require('hlslens').start()<CR>]],
    kopts)
vim.api.nvim_set_keymap('n', 'N',
    [[<Cmd>execute('normal! ' . v:count1 . 'N')<CR><Cmd>lua require('hlslens').start()<CR>]],
    kopts)
vim.api.nvim_set_keymap('n', '*', [[*<Cmd>lua require('hlslens').start()<CR>]], kopts)
vim.api.nvim_set_keymap('n', '#', [[#<Cmd>lua require('hlslens').start()<CR>]], kopts)
vim.api.nvim_set_keymap('n', 'g*', [[g*<Cmd>lua require('hlslens').start()<CR>]], kopts)
vim.api.nvim_set_keymap('n', 'g#', [[g#<Cmd>lua require('hlslens').start()<CR>]], kopts)

vim.api.nvim_set_keymap('x', '*', [[*<Cmd>lua require('hlslens').start()<CR>]], kopts)
vim.api.nvim_set_keymap('x', '#', [[#<Cmd>lua require('hlslens').start()<CR>]], kopts)
vim.api.nvim_set_keymap('x', 'g*', [[g*<Cmd>lua require('hlslens').start()<CR>]], kopts)
vim.api.nvim_set_keymap('x', 'g#', [[g#<Cmd>lua require('hlslens').start()<CR>]], kopts)

vim.api.nvim_set_keymap('n', '<Leader>l', ':noh<CR>', kopts)

Steps to reproduce the behavior:

1. Search for something using * or /
2. Clear highlight using :nohl
3. Write the file using :w
4. Keep repeating step 3, sometimes the highlights and lens will be visible for a short time

Expected behavior

Saving a file shouldn't cause flicker.

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
Add any other context about the problem here.

nvim-hlslens/lua/hlslens/cmdline/init.lua

Lines 330 to 334 in 5e3e908

	event:on('CmdlineLeave', function(e)
	local typ, abort = e.cmdtype, e.abort
	self:detach(typ, abort)
	render:start(true)
	end, self.disposables)

The flicker is triggered from this code.

[kevinhwang91]

Can't reproduce it, maybe some script change your hlsearch.

[MunifTanjim]

Okay, I reproduced it like this:

  vim.api.nvim_create_autocmd("BufWritePre", {
    callback = function()
      vim.wait(2000)
    end,
  })

• Search for something using * or /
• Clear highlight using :nohl
• Write the file using :w
• When the vim.wait is happening, move the cursor (e.g. press j)
• Every once in a while search highlight and lens will flicker

Here vim.wait(2000) is artificially delaying the file save. But in my actual config it happens because of lsp code formatting that runs before the buffer is written.

[kevinhwang91]

Sorry, still can't rerpoduce it.

[mortymacs]

I have the same problem. When I save a file, it shows the lens quickly on every line and then disappears.
My config:

require("hlslens").setup()

Nvim version:

NVIM v0.10.0
Build type: Release
LuaJIT 2.1.1693350652

[Rekwass]

I am able to reproduce the issue with the following config:
minimal.lua

vim.env.LAZY_STDPATH = '.repro'
load(vim.fn.system('curl -s https://raw.githubusercontent.com/folke/lazy.nvim/main/bootstrap.lua'))()

vim.api.nvim_create_autocmd("BufWritePre", {
    callback = function()
        vim.wait(10)
        vim.cmd("m +1")
        vim.cmd("m -2")
    end,
})

require('lazy.minit').repro {
    spec = {
        {
            'kevinhwang91/nvim-hlslens',
            config = function()
                require('hlslens').setup()
            end,
            lazy = false,
        },
    },
}

NVIM v0.10.1
Build type: Release
LuaJIT 2.1.1725453128

In order to see the flickering follow these steps:

1. Create a file and add a couple lines to highlight
   main.cpp

int main() {
  int foo = 1;
  int bar = 2;

  int foobar = foo + bar;

  return foobar;
}

2. Open this file with the minimal.lua configuration with nvim --clean -u minimal.lua main.cpp
3. Highlight a word. int for example
4. Then disable highlight with :noh
5. Save the file with :w. Repeat this step as it is really inconsistent

I worked around the issue with this answer on stackoverflow.

[kevinhwang91]

I am able to reproduce the issue with the following config: minimal.lua

vim.env.LAZY_STDPATH = '.repro'
load(vim.fn.system('curl -s https://raw.githubusercontent.com/folke/lazy.nvim/main/bootstrap.lua'))()

vim.api.nvim_create_autocmd("BufWritePre", {
    callback = function()
        vim.wait(10)
        vim.cmd("m +1")
        vim.cmd("m -2")
    end,
})

require('lazy.minit').repro {
    spec = {
        {
            'kevinhwang91/nvim-hlslens',
            config = function()
                require('hlslens').setup()
            end,
            lazy = false,
        },
    },
}

NVIM v0.10.1 Build type: Release LuaJIT 2.1.1725453128

In order to see the flickering follow these steps:

1. Create a file and add a couple lines to highlight
   main.cpp

int main() {
  int foo = 1;
  int bar = 2;

  int foobar = foo + bar;

  return foobar;
}

2. Open this file with the minimal.lua configuration with nvim --clean -u minimal.lua main.cpp
3. Highlight a word. int for example
4. Then disable highlight with :noh
5. Save the file with :w. Repeat this step as it is really inconsistent

I worked around the issue with this answer on stackoverflow.

Fixed.