fix(pick): fix "choose" variants to not affect current directory

Details:
- It is a side effect of 5833f01 (make picker's window set window-local
  cwd to source cwd) but the core issue is in how Neovim handles cwd
  inside `nvim_win_call` (or even how Vim handles `win_execute`).

Resolve #1525

Author: echasnovski

lua/mini/pick.lua

@@ -2663,10 +2663,15 @@ H.picker_choose = function(picker, pre_command)
 
   local win_id_target = picker.windows.target
   if pre_command ~= nil and H.is_valid_win(win_id_target) then
+    -- Work around Neovim not preserving cwd during `nvim_win_call`
+    -- See: https://github.com/neovim/neovim/issues/32203
+    local picker_cwd, global_cwd = vim.fn.getcwd(0), vim.fn.getcwd(-1, -1)
+    vim.fn.chdir(global_cwd)
     vim.api.nvim_win_call(win_id_target, function()
       vim.cmd(pre_command)
       picker.windows.target = vim.api.nvim_get_current_win()
     end)
+    vim.fn.chdir(picker_cwd)
   end
 
   local ok, res = pcall(picker.opts.source.choose, cur_item)
@@ -3509,7 +3514,7 @@ H.win_set_cwd = function(win_id, cwd)
   if cwd == nil or vim.fn.getcwd(win_id or 0) == cwd then return end
   local f = function() vim.cmd('lcd ' .. vim.fn.fnameescape(cwd)) end
   if win_id == nil or win_id == vim.api.nvim_get_current_win() then return f() end
-  vim.api.nvim_win_call(f, win_id)
+  vim.api.nvim_win_call(win_id, f)
 end
 
 H.seq_along = function(arr)

tests/test_pick.lua

@@ -5444,10 +5444,14 @@ T['Choose'] = new_set()
 
 T['Choose']['works for split/tab variations'] = function()
   local validate = function(key)
+    local global_cwd = child.fn.getcwd(-1, -1)
+    child.lua('_G.source_cwd = ' .. vim.inspect(test_dir_absolute))
+
     local win_id_init = child.api.nvim_get_current_win()
     child.lua_notify([[MiniPick.start({
       source = {
         items = { 'a' },
+        cwd = _G.source_cwd,
         choose = function() _G.target_window = MiniPick.get_picker_state().windows.target end,
       },
     })]])
@@ -5458,6 +5462,10 @@ T['Choose']['works for split/tab variations'] = function()
     -- Should modify target window
     eq(child.lua_get('_G.target_window') ~= win_id_init, true)
 
+    -- Should not modify any current directory
+    eq(child.fn.getcwd(-1, -1), global_cwd)
+    eq(child.fn.getcwd(0), global_cwd)
+
     -- Cleanup
     child.lua('_G.target_window = nil')
   end