bug#33458: 27.0.50; dired loses position when reverted from outside place

[martin rudalics <rudalics@gmx.at>]

 >> I assume you used `C-x b' (switch-to-buffer) to switch back.
 >
 > No, just close DIR-B buffer or do M-: (previous-buffer).
 >
 >> If so, this happens because dired-revert erases and then repopulates
 >> the buffer it's called on, which relocates the markers used by
 >> switch-to-buffer to find window-point when
 >> switch-to-buffer-preserve-window-point is t, which is it by default
 >> since Emacs 26.  If you set that variable to nil, point will be where
 >> you expected after `C-x b'.
 >
 > Now it works for `C-x b' but not for M-: (previous-buffer) of closing
 > DIR-B buffer. Point still lost.

I don't understand well what you want to do here.  But please note
that C-x <left> does not "close" any buffer - it's purpose is to,
maybe only temporarily, show the buffer previously shown in the window
from where you invoke the command.  When invoked with a mouse click it
does not even select that window.  And it tries to show that buffer
with start and point position as shown last in that window.

martin