fix(pick): more carefully restore cursor when setting current window

Details:
- Plain "cache cursor -> set current window -> restore cursor" can fail
  if setting current window leads to changing the buffer it displays
    (cached cursor becomes outdated as it is for the other buffer).
  One example is 'mini.files' default explorer: it automatically
  switches to the alternative buffer on (second) `BufEnter` in the
  buffer for directory path.

- No additional test, since the code path is for Neovim<0.10 which is
  planned to be removed soon-ish.

Resolve #2275

Author: echasnovski

lua/mini/pick.lua

@@ -3623,9 +3623,9 @@ H.set_curwin = function(win_id)
   if not H.is_valid_win(win_id) then return end
   -- Explicitly preserve cursor to fix Neovim<0.10 after choosing position in
   -- already shown buffer
-  local cursor = vim.api.nvim_win_get_cursor(win_id)
+  local buf_id, cursor = vim.api.nvim_win_get_buf(win_id), vim.api.nvim_win_get_cursor(win_id)
   vim.api.nvim_set_current_win(win_id)
-  H.set_cursor(win_id, cursor[1], cursor[2] + 1)
+  if buf_id == vim.api.nvim_win_get_buf(win_id) then H.set_cursor(win_id, cursor[1], cursor[2] + 1) end
 end
 
 H.clear_namespace = function(buf_id, ns_id) pcall(vim.api.nvim_buf_clear_namespace, buf_id, ns_id, 0, -1) end