Description

When I launch opencode inside Neovim’s integrated terminal (with Neovim itself running inside Kitty), the TUI is broken: right border artifacts, misaligned input area, and unstable interaction.
When I launch opencode directly in a Kitty tab, everything works as expected.

Screenshot: left = Neovim :terminal running opencode (broken), right = Kitty terminal running opencode (OK).
(see attached image)

Steps to Reproduce

• Open Kitty.

• Start Neovim.

• Open Neovim’s built-in terminal: :terminal.

• Run opencode.

Compare the result with running opencode directly inside Kitty (without Neovim).

Observed Behavior

• Broken TUI rendering inside Neovim’s terminal (right border cut off, input box misplaced).
• Background stays black (instead of taking native background)

Version: opencode v0.5.12 (shown in UI).

Expected Behavior

Should render and behave exactly the same as in Kitty: clean interface, stable input area, working shortcuts.

Environment

OS: Windows 10

Terminal: Kitty.

Neovim: running inside Kitty, with :terminal.

OpenCode: v0.5.12.

Note

For reference crush had similar issue at the beginning that has been fixed (couldn't find the right commit) cf