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fb180287d0
Problem:
Setting a :bcd buffer into another window, modifies the caller's CWD.
local b = vim.api.nvim_create_buf(true, true)
vim.api.nvim_buf_call(b, function() vim.cmd.bcd('..') end)
vim.cmd('vsplit')
vim.api.nvim_win_set_buf(vim.fn.win_getid(2), b)
:echo haslocaldir(0) haslocaldir(-1,0) haslocaldir(-1,-1,0)
0 0 0
:echo getcwd() ==# getcwd(-1,-1)
0
Analysis:
`ctx_dirs_save` only saves CWD if it predicts the switch can change it.
But win_set_buf() replaces the target window's buffer *after* the
switch, which cannot be "predicted" from `ctx_dirs_save`.
Solution:
Always snapshot whenever the switch enters another window.
Skipping `os_dirname` was a micro-optimization.