Buffer local `switch-to-buffer-preserve-window-point'

[Evgeny Zajcev <lg.zevlg@gmail.com>]

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I think we should add to the documentation that buffer local values for
`switch-to-buffer-obey-display-actions' and
`switch-to-buffer-preserve-window-point' won't work as user would expect.

The problem with their buffer local values is that they are used for buffer
logic *before* buffer is set as current, see `switch-to-buffer'.  We should
either use `(buffer-local-value NAME buffer)' to get their values in
`switch-to-buffer', or add to the documentation that they should not have
buffer local values.

Here is code snippet to trigger unexpected behaviour:

  ;; Switch to scratch and eval
  (progn
    (setq switch-to-buffer-preserve-window-point t)
    (with-current-buffer (get-buffer-create "pwp")
     (setq-local switch-to-buffer-preserve-window-point nil)
     (insert "asnoteh asoensnaot heusnatoeh usanotehu aeosntuhaoe")
     (point))
    (switch-to-buffer "pwp")
    (switch-to-other-buffer 1)

    (with-current-buffer "pwp"
     (goto-char 10)
     (point))
    (switch-to-buffer "pwp")
    ;; Expecting point to be at 10 position, but it remains at the end
    ;; of the line
    )

What do you think?

Thanks

-- 
lg

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