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9cd4dd1c19
Problem: Buffer-local CWD (:bcd) is "sticky", similar to window-local CWD (:lcd). But this contradicts one of its main benefits: per-buffer "project root" for LSP, OSC7. Other problems: - A buffer created with :edit/:enew/:new silently inherits b_localdir (and b_prevdir) from the previous buffer. - curbuf_reusable() refuses to recycle a scratch buffer that has `b_localdir`. - After :new/:vnew/:tabnew the CWD sticks to previous buffer's `b_localdir` even though the new curbuf has none, so :new is not equivalent to ":split | enew", and getcwd() disagrees with haslocaldir(). - Requires "which buffer spawned this buffer" semantics that no other buffer-local state has. Solution: Drop sticky/inherit behavior of buffer-local CWD (:bcd). - do_ecmd: always apply the new curbuf's dir (`fix_current_dir`), like `do_autochdir` already does. :tabnew from a :bcd buffer now reverts to global CWD (and fires DirChanged), same as :tabnew from a :lcd window. - curbuf_reusable(): recycling a scratch buffer frees its b_localdir. To get sticky/inherit behavior of CWD, use `:lcd`.