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bug#24368: 25.1; Assertion failure in attach_marker


From: martin rudalics
Subject: bug#24368: 25.1; Assertion failure in attach_marker
Date: Mon, 05 Sep 2016 16:30:42 +0200

The reason behind this bug is the following construct in
‘window--state-get-1’:

            ,@(when buffer
                ;; All buffer related things go in here.
                (let ((point (window-point window))
                      (start (window-start window)))
                  `((buffer
                     ,(buffer-name buffer)
                     (selected . ,selected)
                     (hscroll . ,(window-hscroll window))
                     (fringes . ,(window-fringes window))
                     (margins . ,(window-margins window))
                     (scroll-bars . ,(window-scroll-bars window))
                     (vscroll . ,(window-vscroll window))
                     (dedicated . ,(window-dedicated-p window))
                     (point . ,(if writable point
                                 (copy-marker point
                                              (buffer-local-value
                                               'window-point-insertion-type
                                               buffer))))
                     (start . ,(if writable start (copy-marker start)))))))))

This saves `point' and `start' as markers in the wrong buffer - in my
example *help* and not *scratch*.  A silly bug but I don't even know how
to put in a ‘with-current-buffer’ with all those backslashes :-(

The ensuing assertion failure should not happen though - somehow we
don't recognize that we set a marker in the wrong buffer.

martin






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