Modern preset + centered window: popup hidden when cursor is at bottom of buffer and bellow keymaps window

[nitaicharan]

I’m having a weird issue with which-key when using the modern preset and a centered layout.

Config

I’m using lazy.nvim. My plugin spec for which-key is:

{
  "folke/which-key.nvim",
  opts = {
    preset = "modern",
    win = {
      padding = { 3, 3 }, -- extra window padding [top/bottom, right/left]
      wo = {},
      -- I also tried playing with:
      -- no_overlap = false,
      -- col = 0.5,
      -- row = 0.5,
    },
    layout = {
      align = "center", -- align columns center
    },
  },
  dependencies = { "echasnovski/mini.nvim" },
}

What I see

• Middle of the buffer:
  If my cursor is somewhere in the middle of the buffer and I press <leader>, I get the expected modern, centered which-key popup with all my mappings.

• Bottom of the buffer:
  If I scroll all the way down so the cursor is at the bottom part of the window and in the middle of the screen (below the which-key window) and then press <leader>, the which-key window opens, but it’s basically empty:

  • I see the border and the bottom help line:
    ESC close x back ^D/^U scroll
  • Inside the window there is only the cursor in the top-left corner and no mappings at all.
  

If I move gradually the cursor back up a few lines and hit <leader> again, the popup shows more mappings as expected and until my cursor is in the upper part of the which-key window.

So the trigger works, the window opens, but the contents disappear only when the cursor is near the bottom of the buffer and under the wich-key window.

[nitaicharan]

Should I open a bug issue to fix it?

[xinx1n]

Both modern and classic have this issue, just with different cursor positions triggering it