Awesome

show trails while moving cursor, within a window or across windows

design choices, limits

• works when cursor moving within one single window
• works when cursor moving across windows, yet there would be break points
• since nvim_buf_set_extmark doesnt supports per-window-based mark, fn.matchadd* must be used
• no fullscreen floatwin + winblend, because i dont use &termguicolor
• no massive ephemeral floatwins, no pre-alloc floatwins
• should be ok with multi-bytes strings
• not supposed to work well with <tab>, which may be 2/4/8-width

status

• just works, imperfectly
• yet many untested edge cases: signcolumn, numbercolumn, tabline, window-statusline, window-border, winbar ...
• since it requires a patched vim.fn.getmousepos, it's not supposed to be used publicly

credits

• i shamelessly stole the basis impl from vim-ranbow-trails
• the bresenham algo