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bug#4016: Acknowledgement (23.1.50; docview: scrolling up breaks after s
From: |
Tassilo Horn |
Subject: |
bug#4016: Acknowledgement (23.1.50; docview: scrolling up breaks after setting a slice) |
Date: |
Mon, 03 Aug 2009 08:46:27 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (gnu/linux) |
Paer Kurlberg <kurlberg@math.kth.se> writes:
> In case it might be helpful: below is a backtrace. It seems that the
> problem is that image-get-display-property (called in the function
> image-next-line) returns the list
>
> ((slice 0 0 1100 1600) (image :type png :file
> "/tmp/docview1000/arnold.dvi-b04e9949bb98146d331479915a45fc5b/page-1.png"
> :pointer arrow))
>
> and therefore image-size complains since a "proper image" should be a
> list whose car equals 'image.
I can reproduce the error. But I'm not too sure where the bug is
located. According to the docs, the display property may be a single
display spec, or a list or vector of such.
,----[ (info "(elisp)Display Property") ]
| The value of the `display' property should be a display specification,
| or a list or vector containing several display specifications.
`----
So in that respect the slice + image spec are ok.
I think that maybe the C function
int valid_image_p (object) Lisp_Object object;
in image.c should be adapted to accept lists/vectors including one image
spec.
Bye,
Tassilo