Can I create custom window decoration?

[dustdfg]

I want to create a bufpane and cut of it small part (several parts in the top) for custom decoration and custom status line. When I just place decoration in the bufpane, I can select it with cursor or do other dirty things with the decor. I would like to make it unselectable and uneditable... Is it possible to do it without dirty hacks with handling all the cursor events and manually preventing user from editing decors?

[taconi]

You set your buffer type to read-only:

bufpane.Buf.Type.Readonly = true

[Heshina-pk]

✅ Best Practices (Depending on Environment):
In Neovim
Use extmarks with virt_text:

Not part of the buffer

Can't be selected or edited

lua
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vim.api.nvim_buf_set_extmark(0, ns, line, 0, {
virt_text = {{"Status Line", "Comment"}},
virt_text_pos = 'overlay'
})
In TUIs (like Bubbletea)
Render decor directly in the View():

Keep editable input below decor

Don’t allow focus/cursor in those lines

go
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b.WriteString("Header\n")
b.WriteString(m.textInput.View())
In GUI/Web
Put decorations in a separate non-focusable element (e.g., pointer-events: none).